Sound Practices Mailing List Files - Volume 2
=========================================================================
From: Steve Van Osdell <svanos@queencity.com>
Subject: [JN] Zalytron Line Array Speakers
Date: Sun, 13 Aug 2000 23:26:24 -0400
Source: Sound Digest Archive v02.n627
Okay, I'm staying on the List. Enough people have written me privately
to convince me to rethink leaving.
Anyway, here is a photo of the Zalytron Line array speaker kit that Dave
Craig just sent me of the ones he just finished (www.zalytron.com). He
says they are 96 SPL.
www.queencity.com/people/svanos/zalytron.jpg
Thanks, Steve
=========================================================================
From: "Daniel Dicker" <dbdicker@worldnet.att.net>
Subject: Re: [JN] Zalytron Line Array Speakers
Date: Mon, 14 Aug 2000 13:11:30 -0700
Source: Sound Digest Archive v02.n627
Steve,
Glad you're staying.
As to the Zalytron/Orca kits....I know that Steve Schenkel is bumming around
the list trying to help drum up business for Zalytron. However, I must say
that the Zalytron/Orca kits are the finest offered on the planet.
The reasons are of course economic. As all DIY'ers seem to know, the
cost of parts compared to a finished commercial product is at least
8X.....sometimes as much as 12X. This makes it easy to figure.....if you
build an amplifier with $1000 worth of parts, a comparable commercial
product will have an MSRP of $8000 at least.
Zalytron kits are a case in point. I built one of the few speaker systems
in the world using the Raven R-3 driver with help from Orca Design and
Zalytron. (check it out at :
http://www.zalytron.com/pictures/Image015.jpg
This was not an inexpensive project because the R-3's are very, very
pricey....but I have built the most wonderful speaker system I have ever
heard. Surely a comparable commercial product would, if available, cost
upwards of $40,000.
But I have heard many of the Zalytron/Orca designs.....at their price
points, they simply have no equal. You would be wise to check them out and
give them a try.
Best,
Dan
- ----- Original Message -----
From: Steve Van Osdell <svanos@queencity.com>
To: Joe List <sound@lists.io.com>
Sent: Sunday, August 13, 2000 8:26 PM
Subject: [JN] Zalytron Line Array Speakers
> Okay, I'm staying on the List. Enough people have written me privately
> to convince me to rethink leaving.
>
> Anyway, here is a photo of the Zalytron Line array speaker kit that Dave
> Craig just sent me of the ones he just finished (www.zalytron.com). He
> says they are 96 SPL.
>
> www.queencity.com/people/svanos/zalytron.jpg
>
> Thanks, Steve
>
>
=========================================================================
From: sschenkel@juno.com
Subject: [JN] Zalytron Summer Sale
Date: Mon, 31 Jul 2000 23:14:43 -0700
Source: Sound Digest Archive v02.n615
Hi All
I just posted a new sale on the Zalytron site.
Steve Schenkel
=========================================================================
From: Jim de Kort <jim@vt52.com>
Subject: [JN] Z calc for L loaded AF
Date: Fri, 03 Dec 1999 21:40:05 +0100
Source: Sound Digest Archive v02.n352
Hi,
Sorry for the title :)
Anybody know the formula for the calculation of the output impedance when
using an anode follower with choke load?
Regards,
Jim de Kort
jim@vt52.com
=========================================================================
From: Allen Wright <AllenVSE@compuserve.com>
Subject: [JN] Z calc for L loaded AF
Date: Sat, 4 Dec 1999 09:03:03 -0500
Source: Sound Digest Archive v02.n353
Jim,
What exactly do you mean by "anode follower"?
Is it possible you are meaning common cathode?
Allen (VSE)
=========================================================================
From: Allen Wright <AllenVSE@compuserve.com>
Subject: Re: [JN] Z calc for L loaded AF
Date: Sun, 5 Dec 1999 07:37:14 -0500
Source: Sound Digest Archive v02.n354
Jim wrote:
>What exactly do you mean by "anode follower"?
>Is it possible you are meaning common cathode?
Yes, same thing... the signal follows the anode voltage swing, cathode is
grounded. A cathode follower is also a common cathode, but it is not an
anode follower :) Sort of like: a cow is an animal with four legs, but an
animal with four legs is not always a cow :)))<<<
I have to disagree, it is not the same thing. I'm sorry to bring this up
again. but using the term "anode follower" for a circuit that is NOT an
anode follower is one of my two hobby horses!
An anode follower is a common cathode circuit with 100% negative feedback
from anode to grid so it has a gain of -1. Normally it's done with a large
resistor (100K plus) from the input signal to the grid, and a similar sized
R from (after) the output cap back to the grid.
Like an opamp used as a -1 gain block with two equal resistors on the -
input and the + input grounded.
The cathode follower has a gain of (almost) plus 1, the anode follower has
a gain of minus 1. They are both called "followers" because they "follow"
close in the footsteps of the input signal...
It is used by Audio Research in their older poweramps as a "gain of one"
phase changer to give internal differential operation from a SE input.
However, a "common cathode" is your regular basic gain stage where the
tubes mU is reflected in the stage's actual gain, which can range from five
to almost 100..
Allen (VSE)
My other pet peve? - don't ask!
=========================================================================
From: "Ron Blaschke" <blascrw@hotmail.com>
Subject: [JN] ZEN & AS-USA
Date: Fri, 29 Jan 1999 14:32:58 PST
Source: Sound Digest Archive v02.n017
I was wondering if anyone had any experience with either of these?
I am a newbie to the tube world and have never built a tube amp. I am
enrolling next quarter in an electronics class at a local college, and I
am eager to learn.
AS-USA I saw in an ad in Glass Audio this month. They have a web page
at http://www.as-usa.com. Their prices seem reasonable. The A-2 kit is
$349.00.
I was considering building the A-2, A-4, or the ZEN (by decware).
Any thoughts on this from anyone?
Also I am planning on building the preamp (no thoughts yet) and
speakers. I was thinking a 2 way using Dynaudio speakers, and stereo
subs (one in the bottom of each speaker) driven by the madisound sub
amp.
Any thoughts there?
TIA.
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
=========================================================================
From: Clay Turner <clayturner@earthlink.net>
Subject: Re: [JN] ZEN & AS-USA
Date: Sat, 30 Jan 1999 13:36:49 -0500
Source: Sound Digest Archive v02.n017
I think if you make a comparison of websites,
Decware vs. ASUSA, and do a dejanews
search on both, Decware wins hands down.
He even has pics up of the whole kit process.
http://www.decware.com/zkit01.htm
For the price difference, though, I think I would
let him make it. I'm not sure about now, but
when they started selling this amp you got a home
trial period of 30 days- I am sure they can't offer this with the
kit, right? So if for $100 extra they do it right _AND_
you get a 30 day money back guarantee I think I would
buy the amp complete and construct a nice speaker kit
from Madisound or some comparable company.
But maybe for $100 they will check/fix a kit built amp?
I get the impression they are easy to deal with and talk to.
My .02
Clay Turner
Ron Blaschke wrote:
> I was wondering if anyone had any experience with either of these?
>
> I am a newbie to the tube world and have never built a tube amp. I am
> enrolling next quarter in an electronics class at a local college, and I
> am eager to learn.
>
> AS-USA I saw in an ad in Glass Audio this month. They have a web page
> at http://www.as-usa.com. Their prices seem reasonable. The A-2 kit is
> $349.00.
>
> I was considering building the A-2, A-4, or the ZEN (by decware).
>
> Any thoughts on this from anyone?
>
> Also I am planning on building the preamp (no thoughts yet) and
> speakers. I was thinking a 2 way using Dynaudio speakers, and stereo
> subs (one in the bottom of each speaker) driven by the madisound sub
> amp.
>
> Any thoughts there?
>
> TIA.
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
Ron Blaschke wrote:
> I was wondering if anyone had any experience with either of these?
>
> I am a newbie to the tube world and have never built a tube amp. I am
> enrolling next quarter in an electronics class at a local college, and I
> am eager to learn.
>
> AS-USA I saw in an ad in Glass Audio this month. They have a web page
> at http://www.as-usa.com. Their prices seem reasonable. The A-2 kit is
> $349.00.
>
> I was considering building the A-2, A-4, or the ZEN (by decware).
>
> Any thoughts on this from anyone?
>
> Also I am planning on building the preamp (no thoughts yet) and
> speakers. I was thinking a 2 way using Dynaudio speakers, and stereo
> subs (one in the bottom of each speaker) driven by the madisound sub
> amp.
>
> Any thoughts there?
>
> TIA.
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
=========================================================================
From: "Neil Brown" <neilb@vol.com>
Subject: [JN] Zeners or diodes in PSU isolation
Date: Wed, 07 Apr 1999 21:30:42 -0500
Source: Sound Digest Archive v02.n114
I dont know if this is the right way to describe it but, I have no problem
with the B+ drooping a little but the isolation to the next stage ie the
driver stages B+ is synchronized to it somewhat, ie it is loaded down when
the output gets high. Could a diode in series stop this backflow of voltage?
Any ideas??
Neil
=========================================================================
From: "Daniel J. Marshall" <danmarshall@worldnet.att.net>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 06:55:46 -0700
Source: Sound Digest Archive v02.n114
Ken Gilbert wrote:
>
> At 09:30 PM 4/7/99 -0500, you wrote:
> >I dont know if this is the right way to describe it but, I have no problem
> >with the B+ drooping a little but the isolation to the next stage ie the
> >driver stages B+ is synchronized to it somewhat, ie it is loaded down when
> >the output gets high. Could a diode in series stop this backflow of voltage?
>
> Neil, it works for me.
>
> In guitar amps the PS is sometimes deliberately under-specced, to get some
> power supply "sag" at high-level playing. The only problem is that the
> whole supply droops, and it starts to sound spongy. One way around this is
> to place a diode between the output stage and the earlier stages, including
> the preamp and phase splitter. That way, the momentary demands by the
> finals for power are not drawn from the VA stage rails, which remain
> cranking, at least for a short while.
>
> KG
>
> Ken Gilbert
> http://www.geocities.com/SunsetStrip/Garage/5701
> ------------------------------------------------
> Tube Guitar Amplifier Repair/Design Technician
> The Guitarist's Choice Inc. http://www.tgcguitar.com
Hi,
I did this trick once on a SS receiver and it made a tremendous
improvement in the low frequency stability, virtually eliminating the
cone "heaving" it was exhibiting following bass transcients. The low
frequency stability of that particular unit was marginal when new and
got worse as time went on to the point where it would oscillate at a
very low frequency with the bass control turned up. Since most SS amps
operate essentially in class B, the improvement is greater than one
would expect in a class A tube amp, esp a PP unit.
DM
=========================================================================
From: "Neil Brown" <neilb@vol.com>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 07:50:43 -0500
Source: Sound Digest Archive v02.n114
- ----------
>From: Ken Gilbert <ride5000@ride.ri.net>
>To: "Neil Brown" <neilb@vol.com>
>Cc: sound@deliverator.io.com
>Subject: Re: [JN] Zeners or diodes in PSU isolation
>Date: Thu, Apr 8, 1999, 7:31 AM
>
> At 09:30 PM 4/7/99 -0500, you wrote:
>>I dont know if this is the right way to describe it but, I have no problem
>>with the B+ drooping a little but the isolation to the next stage ie the
>>driver stages B+ is synchronized to it somewhat, ie it is loaded down when
>>the output gets high. Could a diode in series stop this backflow of voltage?
>
> Neil, it works for me.
>
> In guitar amps the PS is sometimes deliberately under-specced, to get some
> power supply "sag" at high-level playing. The only problem is that the
> whole supply droops, and it starts to sound spongy. One way around this is
> to place a diode between the output stage and the earlier stages, including
> the preamp and phase splitter. That way, the momentary demands by the
> finals for power are not drawn from the VA stage rails, which remain
> cranking, at least for a short while.
>
> KG
>
>
> Ken Gilbert
> http://www.geocities.com/SunsetStrip/Garage/5701
> ------------------------------------------------
> Tube Guitar Amplifier Repair/Design Technician
> The Guitarist's Choice Inc. http://www.tgcguitar.com
>
Well I guess the bottom comes off the ST70 again tonight, I reduced the
de-coupling resister (if that is the right name for the resister from the B+
cap the the next stage B+ cap) to increase the driver stage voltage, (hum
not being a problem since it is an entirely balanced ST70 now with phase
splitting done by the input transformer), helped the sound greatly getting
the 6cg7 current up a little at a higher plate voltage, but the psu sag now
inflicts the driver stage and it is very noticeable what it does to the
sound listening to a freq sweep on a sony test CD. hHe bass almost develops
a doubling sort of sound like the woofer is outa travel, I raised the
resister and the problem disappeared. It looked nasty on the scope with a
dummy load, and comparing the supply droop with the output on the second
channel of the scope the relationship is seemingly obvious. The B+for the
output droops approx 10V under load and the driver about 5V.
I just hate the thought of putting any more silicon into the old girl, she
may have an allergic reaction..
Neil
=========================================================================
From: Ken Gilbert <ride5000@ride.ri.net>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 08:31:32 -0400
Source: Sound Digest Archive v02.n114
At 09:30 PM 4/7/99 -0500, you wrote:
>I dont know if this is the right way to describe it but, I have no problem
>with the B+ drooping a little but the isolation to the next stage ie the
>driver stages B+ is synchronized to it somewhat, ie it is loaded down when
>the output gets high. Could a diode in series stop this backflow of voltage?
Neil, it works for me.
In guitar amps the PS is sometimes deliberately under-specced, to get some
power supply "sag" at high-level playing. The only problem is that the
whole supply droops, and it starts to sound spongy. One way around this is
to place a diode between the output stage and the earlier stages, including
the preamp and phase splitter. That way, the momentary demands by the
finals for power are not drawn from the VA stage rails, which remain
cranking, at least for a short while.
KG
Ken Gilbert
http://www.geocities.com/SunsetStrip/Garage/5701
- ------------------------------------------------
Tube Guitar Amplifier Repair/Design Technician
The Guitarist's Choice Inc. http://www.tgcguitar.com
=========================================================================
From: David Home <tubehead@vcn.bc.ca>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 8 Apr 1999 11:42:56 -0700 (PDT)
Source: Sound Digest Archive v02.n114
Hello Niel. I think you are rapidly coming to the end of what can be done
with a ST70. The bloody chassis is too small to do much of anything, and
the PS is pretty maxed out for current. Options you might have thought of
but ruled out are many. Increasing the capacity and regulation of the PS
would be great, but is impossible without a new larger chassis. Shunt
regulating the voltage supplying the driver would do the trick, but you
don't have the room or the extra 10-20ma to spare. HAve you tried
increasing the size of the recoupling capacitor ALOT? Using photoflash
caps might work as they are small. A 30H choke instead of a resistor might
work, but where to put it? Or convert your rectification to
HExFred diodes and put in BIG caps to stiffen the PS...
I generally got a bad feeling about the diode in the B+ thing, but others
claim good results with it so who knows? Let us know how it sounds.
regards, David
On Thu, 8 Apr 1999, Neil Brown wrote:
>
>
> ----------
> >From: Ken Gilbert <ride5000@ride.ri.net>
> >To: "Neil Brown" <neilb@vol.com>
> >Cc: sound@deliverator.io.com
> >Subject: Re: [JN] Zeners or diodes in PSU isolation
> >Date: Thu, Apr 8, 1999, 7:31 AM
> >
>
> > At 09:30 PM 4/7/99 -0500, you wrote:
> >>I dont know if this is the right way to describe it but, I have no problem
> >>with the B+ drooping a little but the isolation to the next stage ie the
> >>driver stages B+ is synchronized to it somewhat, ie it is loaded down when
> >>the output gets high. Could a diode in series stop this backflow of voltage?
> >
> > Neil, it works for me.
> >
> > In guitar amps the PS is sometimes deliberately under-specced, to get some
> > power supply "sag" at high-level playing. The only problem is that the
> > whole supply droops, and it starts to sound spongy. One way around this is
> > to place a diode between the output stage and the earlier stages, including
> > the preamp and phase splitter. That way, the momentary demands by the
> > finals for power are not drawn from the VA stage rails, which remain
> > cranking, at least for a short while.
> >
> > KG
> >
> >
> > Ken Gilbert
> > http://www.geocities.com/SunsetStrip/Garage/5701
> > ------------------------------------------------
> > Tube Guitar Amplifier Repair/Design Technician
> > The Guitarist's Choice Inc. http://www.tgcguitar.com
> >
>
> Well I guess the bottom comes off the ST70 again tonight, I reduced the
> de-coupling resister (if that is the right name for the resister from the B+
> cap the the next stage B+ cap) to increase the driver stage voltage, (hum
> not being a problem since it is an entirely balanced ST70 now with phase
> splitting done by the input transformer), helped the sound greatly getting
> the 6cg7 current up a little at a higher plate voltage, but the psu sag now
> inflicts the driver stage and it is very noticeable what it does to the
> sound listening to a freq sweep on a sony test CD. hHe bass almost develops
> a doubling sort of sound like the woofer is outa travel, I raised the
> resister and the problem disappeared. It looked nasty on the scope with a
> dummy load, and comparing the supply droop with the output on the second
> channel of the scope the relationship is seemingly obvious. The B+for the
> output droops approx 10V under load and the driver about 5V.
>
> I just hate the thought of putting any more silicon into the old girl, she
> may have an allergic reaction..
>
> Neil
>
>
=========================================================================
From: Tom Ronan <tronan@orion.it.luc.edu>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 14:41:59 -0500
Source: Sound Digest Archive v02.n114
At 11:42 AM 4/8/99 -0700, you wrote:
>Hello Niel. I think you are rapidly coming to the end of what can be done
>with a ST70. The bloody chassis is too small to do much of anything, and
>the PS is pretty maxed out for current. Options you might have thought of
>but ruled out are many. Increasing the capacity and regulation of the PS
>would be great, but is impossible without a new larger chassis. Shunt
>regulating the voltage supplying the driver would do the trick, but you
>don't have the room or the extra 10-20ma to spare. HAve you tried
>increasing the size of the recoupling capacitor ALOT? Using photoflash
>caps might work as they are small. A 30H choke instead of a resistor might
>work, but where to put it? Or convert your rectification to
>HExFred diodes and put in BIG caps to stiffen the PS...
>
>I generally got a bad feeling about the diode in the B+ thing, but others
>claim good results with it so who knows? Let us know how it sounds.
How about adding a nice potted tranny on a second chassis, using the existing
tranny for filament and bias, and using something with lots of current on a
little outboard umbilical. After all, there is this octal socket just for that
on the chassis....it was just meant to be used to supply a pre, not as a supply
for the amp.
Tom
- --------------------------------------------------
Tom Ronan 1045 W. Montana Chicago, IL 60614
Lowther America http://www.lowther-america.com
Oris 150 Horns http://orion.it.luc.edu/~tronan
=========================================================================
From: "Neil Brown" <neilb@vol.com>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 18:59:55 -0500
Source: Sound Digest Archive v02.n115
Funny you should mention this because I have a suitable transformer which
has plenty of heater windings and a secondary at 450-350-0-350-450 (@250ma
DC), I don't know how exactly the manufacturer rated it for DC Ma and yet
gives an AC voltage on the taps. Anyhow, if it truly is a 250Ma transformer
it should replace the dynaco one nicely, it fits the same mounting holes and
is a potted beast which is approx. 1/4 inch taller than the cage. Shame
about the cage, I'll just have to train the kids (actually it'll go nicely
in a nearby closet!) I would have to widen the hole in the chassis a little
to accommodate it but it would fit. Is 250Ma enough for the St70 to be less
dippy?
Meanwhile I like the idea of using the pre takeoff socket to duct B+ in to
it... I could even have a delay switch to trun the external on and allow the
tubes to warm before putting B+ on em...
Tonight I am gonna go the lazy route and find a diode..
Neil
- ----------
>From: Tom Ronan <tronan@orion.it.luc.edu>
>To: sound@lists.io.com
>Subject: Re: [JN] Zeners or diodes in PSU isolation
>Date: Thu, Apr 8, 1999, 2:41 PM
>
> At 11:42 AM 4/8/99 -0700, you wrote:
>>Hello Niel. I think you are rapidly coming to the end of what can be done
>>with a ST70. The bloody chassis is too small to do much of anything, and
>>the PS is pretty maxed out for current. Options you might have thought of
>>but ruled out are many. Increasing the capacity and regulation of the PS
>>would be great, but is impossible without a new larger chassis. Shunt
>>regulating the voltage supplying the driver would do the trick, but you
>>don't have the room or the extra 10-20ma to spare. HAve you tried
>>increasing the size of the recoupling capacitor ALOT? Using photoflash
>>caps might work as they are small. A 30H choke instead of a resistor might
>>work, but where to put it? Or convert your rectification to
>>HExFred diodes and put in BIG caps to stiffen the PS...
>>
>>I generally got a bad feeling about the diode in the B+ thing, but others
>>claim good results with it so who knows? Let us know how it sounds.
>
> How about adding a nice potted tranny on a second chassis, using the existing
> tranny for filament and bias, and using something with lots of current on a
> little outboard umbilical. After all, there is this octal socket just for
that
> on the chassis....it was just meant to be used to supply a pre, not as a
supply
> for the amp.
>
> Tom
> --------------------------------------------------
> Tom Ronan 1045 W. Montana Chicago, IL 60614
> Lowther America http://www.lowther-america.com
> Oris 150 Horns http://orion.it.luc.edu/~tronan
>
=========================================================================
From: "Neil Brown" <neilb@vol.com>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 19:04:25 -0500
Source: Sound Digest Archive v02.n115
Yes I actually added all the sections of the cap bar the first two to
de-couple the driver stage and another 100uF as well. didn't make much
difference at all
I could just regulate the driver stage to a lower voltage and recalc the
bias but chassis space is as you mention low, especially with the two potter
input trannies (they are about 1.5" squeare and almost as tall as the El34)
and the then two driver tubes... spabe is tight. I suppose I coule use the
takeoff sockets to hang the regualor tube on but it would be messy!
Off to try the diode... :-(
Neil
>From: David Home <tubehead@vcn.bc.ca>
>To: Neil Brown <neilb@vol.com>
>Cc: sound@deliverator.io.com
>Subject: Re: [JN] Zeners or diodes in PSU isolation
>Date: Thu, Apr 8, 1999, 1:42 PM
>
> Hello Niel. I think you are rapidly coming to the end of what can be done
> with a ST70. The bloody chassis is too small to do much of anything, and
> the PS is pretty maxed out for current. Options you might have thought of
> but ruled out are many. Increasing the capacity and regulation of the PS
> would be great, but is impossible without a new larger chassis. Shunt
> regulating the voltage supplying the driver would do the trick, but you
> don't have the room or the extra 10-20ma to spare. HAve you tried
> increasing the size of the recoupling capacitor ALOT? Using photoflash
> caps might work as they are small. A 30H choke instead of a resistor might
> work, but where to put it? Or convert your rectification to
> HExFred diodes and put in BIG caps to stiffen the PS...
>
> I generally got a bad feeling about the diode in the B+ thing, but others
> claim good results with it so who knows? Let us know how it sounds.
>
> regards, David
> On Thu, 8 Apr 1999, Neil Brown wrote:
>
>>
>>
>> ----------
>> >From: Ken Gilbert <ride5000@ride.ri.net>
>> >To: "Neil Brown" <neilb@vol.com>
>> >Cc: sound@deliverator.io.com
>> >Subject: Re: [JN] Zeners or diodes in PSU isolation
>> >Date: Thu, Apr 8, 1999, 7:31 AM
>> >
>>
>> > At 09:30 PM 4/7/99 -0500, you wrote:
>> >>I dont know if this is the right way to describe it but, I have no problem
>> >>with the B+ drooping a little but the isolation to the next stage ie the
>> >>driver stages B+ is synchronized to it somewhat, ie it is loaded down when
>> >>the output gets high. Could a diode in series stop this backflow of
voltage?
>> >
>> > Neil, it works for me.
>> >
>> > In guitar amps the PS is sometimes deliberately under-specced, to get some
>> > power supply "sag" at high-level playing. The only problem is that the
>> > whole supply droops, and it starts to sound spongy. One way around this is
>> > to place a diode between the output stage and the earlier stages, including
>> > the preamp and phase splitter. That way, the momentary demands by the
>> > finals for power are not drawn from the VA stage rails, which remain
>> > cranking, at least for a short while.
>> >
>> > KG
>> >
>> >
>> > Ken Gilbert
>> > http://www.geocities.com/SunsetStrip/Garage/5701
>> > ------------------------------------------------
>> > Tube Guitar Amplifier Repair/Design Technician
>> > The Guitarist's Choice Inc. http://www.tgcguitar.com
>> >
>>
>> Well I guess the bottom comes off the ST70 again tonight, I reduced the
>> de-coupling resister (if that is the right name for the resister from the B+
>> cap the the next stage B+ cap) to increase the driver stage voltage, (hum
>> not being a problem since it is an entirely balanced ST70 now with phase
>> splitting done by the input transformer), helped the sound greatly getting
>> the 6cg7 current up a little at a higher plate voltage, but the psu sag now
>> inflicts the driver stage and it is very noticeable what it does to the
>> sound listening to a freq sweep on a sony test CD. hHe bass almost develops
>> a doubling sort of sound like the woofer is outa travel, I raised the
>> resister and the problem disappeared. It looked nasty on the scope with a
>> dummy load, and comparing the supply droop with the output on the second
>> channel of the scope the relationship is seemingly obvious. The B+for the
>> output droops approx 10V under load and the driver about 5V.
>>
>> I just hate the thought of putting any more silicon into the old girl, she
>> may have an allergic reaction..
>>
>> Neil
>>
>>
>
=========================================================================
From: "Neil Brown" <neilb@vol.com>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Thu, 08 Apr 1999 20:40:49 -0500
Source: Sound Digest Archive v02.n115
Well I leaped in and tried several things, the drop seems to be loading by
the drivers stage itself not as I suspects suck back from the outputs, if i
reduce the current limiting bits along the way it is clearly drawing the 17
or 18ma I expect it to and over a 2K resister that corresponds to 2200*.018
whjich is .3 volts... hmm not as much as I thought, well I put a second
choke in aftre the output stage and another 470ohm with 100uF decoupling,
driver b+ sits at 398 volts and under overload it droops to 392 with max
output (undistorted) it is 395. Am I worrying too much or is this
acceptable? I havent run the sweep through it yet though...
Neil
- ----------
>From: "Neil Brown" <neilb@vol.com>
>To: Tom Ronan <tronan@orion.it.luc.edu>, sound@lists.io.com
>Subject: Re: [JN] Zeners or diodes in PSU isolation
>Date: Thu, Apr 8, 1999, 6:59 PM
>
> Funny you should mention this because I have a suitable transformer which
> has plenty of heater windings and a secondary at 450-350-0-350-450 (@250ma
> DC), I don't know how exactly the manufacturer rated it for DC Ma and yet
> gives an AC voltage on the taps. Anyhow, if it truly is a 250Ma transformer
> it should replace the dynaco one nicely, it fits the same mounting holes and
> is a potted beast which is approx. 1/4 inch taller than the cage. Shame
> about the cage, I'll just have to train the kids (actually it'll go nicely
> in a nearby closet!) I would have to widen the hole in the chassis a little
> to accommodate it but it would fit. Is 250Ma enough for the St70 to be less
> dippy?
>
> Meanwhile I like the idea of using the pre takeoff socket to duct B+ in to
> it... I could even have a delay switch to trun the external on and allow the
> tubes to warm before putting B+ on em...
>
> Tonight I am gonna go the lazy route and find a diode..
>
> Neil
>
> ----------
>>From: Tom Ronan <tronan@orion.it.luc.edu>
>>To: sound@lists.io.com
>>Subject: Re: [JN] Zeners or diodes in PSU isolation
>>Date: Thu, Apr 8, 1999, 2:41 PM
>>
>
>> At 11:42 AM 4/8/99 -0700, you wrote:
>>>Hello Niel. I think you are rapidly coming to the end of what can be done
>>>with a ST70. The bloody chassis is too small to do much of anything, and
>>>the PS is pretty maxed out for current. Options you might have thought of
>>>but ruled out are many. Increasing the capacity and regulation of the PS
>>>would be great, but is impossible without a new larger chassis. Shunt
>>>regulating the voltage supplying the driver would do the trick, but you
>>>don't have the room or the extra 10-20ma to spare. HAve you tried
>>>increasing the size of the recoupling capacitor ALOT? Using photoflash
>>>caps might work as they are small. A 30H choke instead of a resistor might
>>>work, but where to put it? Or convert your rectification to
>>>HExFred diodes and put in BIG caps to stiffen the PS...
>>>
>>>I generally got a bad feeling about the diode in the B+ thing, but others
>>>claim good results with it so who knows? Let us know how it sounds.
>>
>> How about adding a nice potted tranny on a second chassis, using the existing
>> tranny for filament and bias, and using something with lots of current on a
>> little outboard umbilical. After all, there is this octal socket just for
> that
>> on the chassis....it was just meant to be used to supply a pre, not as a
> supply
>> for the amp.
>>
>> Tom
>> --------------------------------------------------
>> Tom Ronan 1045 W. Montana Chicago, IL 60614
>> Lowther America http://www.lowther-america.com
>> Oris 150 Horns http://orion.it.luc.edu/~tronan
>>
>
=========================================================================
From: davidbarnett@aristotle.net (David Barnett)
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Fri, 09 Apr 1999 06:22:23 GMT
Source: Sound Digest Archive v02.n115
On Thu, 08 Apr 1999 18:59:55 -0500, "Neil Brown" <neilb@vol.com>
wrote:
>Shame about the cage...
The Stereo-70 cage has other uses. LP record sleeves fit perfectly,
for example.
- --dnb
=========================================================================
From: David Home <tubehead@vcn.bc.ca>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Fri, 9 Apr 1999 11:44:37 -0700 (PDT)
Source: Sound Digest Archive v02.n117
18ma through a 2.2K resistor results in a 39.6V drop. Is this what you
find? If your Driver B+ is 298V, what is on the output tubes?
I think a drop of 3V from no signal to clipping is something I could live
with. Others may differ. Regards, DAvid
On Thu, 8 Apr 1999, Neil Brown wrote:
> Well I leaped in and tried several things, the drop seems to be loading by
> the drivers stage itself not as I suspects suck back from the outputs, if i
> reduce the current limiting bits along the way it is clearly drawing the 17
> or 18ma I expect it to and over a 2K resister that corresponds to 2200*.018
> whjich is .3 volts... hmm not as much as I thought, well I put a second
> choke in aftre the output stage and another 470ohm with 100uF decoupling,
> driver b+ sits at 398 volts and under overload it droops to 392 with max
> output (undistorted) it is 395. Am I worrying too much or is this
> acceptable? I havent run the sweep through it yet though...
>
> Neil
>
> ----------
> >From: "Neil Brown" <neilb@vol.com>
> >To: Tom Ronan <tronan@orion.it.luc.edu>, sound@lists.io.com
> >Subject: Re: [JN] Zeners or diodes in PSU isolation
> >Date: Thu, Apr 8, 1999, 6:59 PM
> >
>
> > Funny you should mention this because I have a suitable transformer which
> > has plenty of heater windings and a secondary at 450-350-0-350-450 (@250ma
> > DC), I don't know how exactly the manufacturer rated it for DC Ma and yet
> > gives an AC voltage on the taps. Anyhow, if it truly is a 250Ma transformer
> > it should replace the dynaco one nicely, it fits the same mounting holes and
> > is a potted beast which is approx. 1/4 inch taller than the cage. Shame
> > about the cage, I'll just have to train the kids (actually it'll go nicely
> > in a nearby closet!) I would have to widen the hole in the chassis a little
> > to accommodate it but it would fit. Is 250Ma enough for the St70 to be less
> > dippy?
> >
> > Meanwhile I like the idea of using the pre takeoff socket to duct B+ in to
> > it... I could even have a delay switch to trun the external on and allow the
> > tubes to warm before putting B+ on em...
> >
> > Tonight I am gonna go the lazy route and find a diode..
> >
> > Neil
> >
> > ----------
> >>From: Tom Ronan <tronan@orion.it.luc.edu>
> >>To: sound@lists.io.com
> >>Subject: Re: [JN] Zeners or diodes in PSU isolation
> >>Date: Thu, Apr 8, 1999, 2:41 PM
> >>
> >
> >> At 11:42 AM 4/8/99 -0700, you wrote:
> >>>Hello Niel. I think you are rapidly coming to the end of what can be done
> >>>with a ST70. The bloody chassis is too small to do much of anything, and
> >>>the PS is pretty maxed out for current. Options you might have thought of
> >>>but ruled out are many. Increasing the capacity and regulation of the PS
> >>>would be great, but is impossible without a new larger chassis. Shunt
> >>>regulating the voltage supplying the driver would do the trick, but you
> >>>don't have the room or the extra 10-20ma to spare. HAve you tried
> >>>increasing the size of the recoupling capacitor ALOT? Using photoflash
> >>>caps might work as they are small. A 30H choke instead of a resistor might
> >>>work, but where to put it? Or convert your rectification to
> >>>HExFred diodes and put in BIG caps to stiffen the PS...
> >>>
> >>>I generally got a bad feeling about the diode in the B+ thing, but others
> >>>claim good results with it so who knows? Let us know how it sounds.
> >>
> >> How about adding a nice potted tranny on a second chassis, using the existing
> >> tranny for filament and bias, and using something with lots of current on a
> >> little outboard umbilical. After all, there is this octal socket just for
> > that
> >> on the chassis....it was just meant to be used to supply a pre, not as a
> > supply
> >> for the amp.
> >>
> >> Tom
> >> --------------------------------------------------
> >> Tom Ronan 1045 W. Montana Chicago, IL 60614
> >> Lowther America http://www.lowther-america.com
> >> Oris 150 Horns http://orion.it.luc.edu/~tronan
> >>
> >
>
=========================================================================
From: "Neil Brown" <neilb@vol.com>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Fri, 09 Apr 1999 18:19:42 -0500
Source: Sound Digest Archive v02.n117
Driver B+ is 398 volts, B+ for outputs is 430 volts. What is the peak
current I should need for the outputs in my ST70? is 250Ma enough?
Well anyhow, thanks for the replies and suggestions. The diode made no
worthwhile or worthless difference at all so I ditched it. I think I have
gotten it about as good as it will get with out as has been suggested by
some using a bigger chassis.
Next project... migrate to bigger chassis, I just happen to have one :-)
Neil
- ----------
>From: David Home <tubehead@vcn.bc.ca>
>To: Neil Brown <neilb@vol.com>
>Subject: Re: [JN] Zeners or diodes in PSU isolation
>Date: Fri, Apr 9, 1999, 1:44 PM
>
> 18ma through a 2.2K resistor results in a 39.6V drop. Is this what you
> find? If your Driver B+ is 298V, what is on the output tubes?
>
> I think a drop of 3V from no signal to clipping is something I could live
> with. Others may differ. Regards, DAvid
>
> On Thu, 8 Apr 1999, Neil Brown wrote:
>
>> Well I leaped in and tried several things, the drop seems to be loading by
>> the drivers stage itself not as I suspects suck back from the outputs, if i
>> reduce the current limiting bits along the way it is clearly drawing the 17
>> or 18ma I expect it to and over a 2K resister that corresponds to 2200*.018
>> whjich is .3 volts... hmm not as much as I thought, well I put a second
>> choke in aftre the output stage and another 470ohm with 100uF decoupling,
>> driver b+ sits at 398 volts and under overload it droops to 392 with max
>> output (undistorted) it is 395. Am I worrying too much or is this
>> acceptable? I havent run the sweep through it yet though...
>>
>> Neil
>>
>> ----------
>> >From: "Neil Brown" <neilb@vol.com>
>> >To: Tom Ronan <tronan@orion.it.luc.edu>, sound@lists.io.com
>> >Subject: Re: [JN] Zeners or diodes in PSU isolation
>> >Date: Thu, Apr 8, 1999, 6:59 PM
>> >
>>
>> > Funny you should mention this because I have a suitable transformer which
>> > has plenty of heater windings and a secondary at 450-350-0-350-450 (@250ma
>> > DC), I don't know how exactly the manufacturer rated it for DC Ma and yet
>> > gives an AC voltage on the taps. Anyhow, if it truly is a 250Ma transformer
>> > it should replace the dynaco one nicely, it fits the same mounting holes
and
>> > is a potted beast which is approx. 1/4 inch taller than the cage. Shame
>> > about the cage, I'll just have to train the kids (actually it'll go nicely
>> > in a nearby closet!) I would have to widen the hole in the chassis a little
>> > to accommodate it but it would fit. Is 250Ma enough for the St70 to be less
>> > dippy?
>> >
>> > Meanwhile I like the idea of using the pre takeoff socket to duct B+ in to
>> > it... I could even have a delay switch to trun the external on and allow
the
>> > tubes to warm before putting B+ on em...
>> >
>> > Tonight I am gonna go the lazy route and find a diode..
>> >
>> > Neil
>> >
>> > ----------
>> >>From: Tom Ronan <tronan@orion.it.luc.edu>
>> >>To: sound@lists.io.com
>> >>Subject: Re: [JN] Zeners or diodes in PSU isolation
>> >>Date: Thu, Apr 8, 1999, 2:41 PM
>> >>
>> >
>> >> At 11:42 AM 4/8/99 -0700, you wrote:
>> >>>Hello Niel. I think you are rapidly coming to the end of what can be done
>> >>>with a ST70. The bloody chassis is too small to do much of anything, and
>> >>>the PS is pretty maxed out for current. Options you might have thought of
>> >>>but ruled out are many. Increasing the capacity and regulation of the PS
>> >>>would be great, but is impossible without a new larger chassis. Shunt
>> >>>regulating the voltage supplying the driver would do the trick, but you
>> >>>don't have the room or the extra 10-20ma to spare. HAve you tried
>> >>>increasing the size of the recoupling capacitor ALOT? Using photoflash
>> >>>caps might work as they are small. A 30H choke instead of a resistor might
>> >>>work, but where to put it? Or convert your rectification to
>> >>>HExFred diodes and put in BIG caps to stiffen the PS...
>> >>>
>> >>>I generally got a bad feeling about the diode in the B+ thing, but others
>> >>>claim good results with it so who knows? Let us know how it sounds.
>> >>
>> >> How about adding a nice potted tranny on a second chassis, using the
existing
>> >> tranny for filament and bias, and using something with lots of current on
a
>> >> little outboard umbilical. After all, there is this octal socket just for
>> > that
>> >> on the chassis....it was just meant to be used to supply a pre, not as a
>> > supply
>> >> for the amp.
>> >>
>> >> Tom
>> >> --------------------------------------------------
>> >> Tom Ronan 1045 W. Montana Chicago, IL 60614
>> >> Lowther America http://www.lowther-america.com
>> >> Oris 150 Horns http://orion.it.luc.edu/~tronan
>> >>
>> >
>>
>
=========================================================================
From: evaguido <EvaGuido@iaehv.nl>
Subject: Re: [JN] Zeners or diodes in PSU isolation
Date: Sat, 10 Apr 1999 18:56:44 +0200
Source: Sound Digest Archive v02.n118
Please consider that zeners are noise sources. The frequency content of the
noise they produce is nasty
Avoid zeners or make sure that the "are not in the signal"
Guido
=========================================================================
From: houndman@onix.com
Subject: [JN] Zenion speakers
Date: Fri, 2 Mar 2001 03:51:30 -0500
Source: Sound Digest Archive v02.n823
anyone seen anything on a loudspeaker using a setup used to move air for
air purifiers with no fan ??
- -----------------
\/ince ++
working on breeding an Afghan that Doesn't mat.... And
comes when called... I want a Toucan that won't wake me during the day.
Impossable they say.... I have a Snapper to feed.
Playing around with SE tube amps. Think I'd try something easy ??
=========================================================================
From: TubeGarden@aol.com
Subject: [JN] Zenith 6L6G
Date: Fri, 19 Nov 1999 23:23:47 EST
Source: Sound Digest Archive v02.n338
Greets Jeets Neets,
Emission Labs in Japan has a pic of Zenith 6L6G in its Best by Pentodes, so I
thought I would fire up a pair and listen.
I did my slow cathode warm-up. I have a 10R 25W WW pot between the filter
caps on the DC amp fils circuit. (The PS tubes have their own circuits.) This
allows me to turn the DC down below a volt and bring it up slowly. I monitor
the voltage across the pins of the output tubes, plus on one tube, and yada
yada yada...
Once up to 6.3, I just let it sit and bask in its own juices...braise, as it
were, for an hour or so.
The I turn on the B+ and let it brown :)
After a couple hours, I start playing music.
Idle in this circuit is 185V and 50 mA. UL parafeed SE.
Same old 396A driving.
Yes, friends, this is a sweet, huge tube. Wish I had a matched pair (one
draws 51 mA, the other 49... ;)
Al's generic 7AC amp finds another willing partner in musical bliss. Even
Fred Astaire's voice seems musical.
Thank you, Emission. Labs.
Happy Ears!
Al B^}
Alan J. Marcy
PHX, AZ
SEE:
http://www.macnet.or.jp/pa/upi-k/tube2.html
=========================================================================
From: "STEVE CORNETT" <SCORNETT@usagroup.com>
Subject: Re: [JN] Zenith 6L6G
Date: Mon, 22 Nov 1999 10:46:43 -0500
Source: Sound Digest Archive v02.n340
Al posted:
"...Al's generic 7AC amp finds another willing partner in musical bliss. Even
Fred Astaire's voice seems musical..."
Hey, watch it. I like Fred's singing. So did a lot of the composers who wrote for him (you know, guy
s like Porter and Berlin.) Did you ever hear the one about the studio flack who reviewed his origina
l screen test? "Can't act, can't sing, dances a little."
Steve C.
=========================================================================
From: Robert C Chambers <rchamber@norwich.edu>
Subject: [JN] Zero-Bias SV 811-10/Dyna MK III Output Trans for SE?
Date: Fri, 25 Jun 1999 12:16:58 -0400 (EDT)
Source: Sound Digest Archive v02.n188
Hello-
I'm very new to the list. This is my first post and a trial.
Eric Barbour has written two articles in Glass Audio about using
Svetlana's SV 811-10 in a zero bias, thus Class A2, power amplifier
design. In the articles, he recycled a Dyna MK III chassis, power trans
and indicated that one could use the output trans if it was undamaged,
but that it would be better to use a One Electron UBT-2 (4.8K primary).
I wrote a letter querrying him about the 811-10 exceeding maximum
disippation at the quiescent condition, but I have never built the amp to
find out for myself.
If I don't have to, I'd rather not purchase a pair of UBT-2s because to
do so would delay my entry to SE DIY by months, So...
Has anyone used Dyna MK III outputs for SE? Any ideas as to maximum
plate current? Has anyone tried the 811-10 A2 amps? Any thoughts would
be much appreciated.
Best Regards,
Robert
=========================================================================
From: "Chris Beck" <cbeck@brewercompany.com>
Subject: Re: [JN] Zero-Bias SV 811-10/Dyna MK III Output Trans for SE?
Date: Fri, 25 Jun 1999 13:59:29 -0500
Source: Sound Digest Archive v02.n188
Hello, Robert.
I've built a similar circuit by Eric as you have described, except this one
was from a Vacuum Tube Valley issue (see my web page). I have not seen the
Glass Audio amp, but gather the circuit is rather similar.
In any case, if you run the SV811-10 with less than 500V on the plate at
zero bias, you should be fine as far as dissipation goes. I used the
SV572-10 in my amp which has roughly double the dissipation capability
(125W vs. 65W) but otherwise generally equivalent electrical specs.
Regarding the output transformer: I would STRONGLY suggest NOT to use the
MKIII output iron for a single ended amp. It will work, but the sound will
not be anywhere near the potential of the amp. Eric's circuit that I used
runs the tube at over 100mA of current. This will give a PP transformer
absolute fits, no matter how big it is. The One Electron unit is a good
tranny, but limited to 110mA, which will be pushed to the limit here. I
used the Electra-Print MT5KB transformer, which is rated conservatively at
150mA current. It's rather large at 14 pounds and may not fit a MKIII
chassis.
Otherwise, it's a very fine amp. I have compared them to several other
amps, both SE and PP and they sound excellent. Are they the best or most
optimal design? Nope. But for a beginner (which I still am) they are
perfect to build because they are so simple.
Welcome aboard, you will learn a lot here.
Chris Beck
See my web page at: http://www.execpc.com/~n9zes/index.htm
- ----------
> From: Robert C Chambers <rchamber@norwich.edu>
> To: sound@io.com
> Subject: [JN] Zero-Bias SV 811-10/Dyna MK III Output Trans for SE?
> Date: Friday, June 25, 1999 11:16 AM
>
>
> Hello-
>
> I'm very new to the list. This is my first post and a trial.
>
> Eric Barbour has written two articles in Glass Audio about using
> Svetlana's SV 811-10 in a zero bias, thus Class A2, power amplifier
> design. In the articles, he recycled a Dyna MK III chassis, power trans
> and indicated that one could use the output trans if it was undamaged,
> but that it would be better to use a One Electron UBT-2 (4.8K primary).
>
> I wrote a letter querrying him about the 811-10 exceeding maximum
> disippation at the quiescent condition, but I have never built the amp to
> find out for myself.
>
> If I don't have to, I'd rather not purchase a pair of UBT-2s because to
> do so would delay my entry to SE DIY by months, So...
>
> Has anyone used Dyna MK III outputs for SE? Any ideas as to maximum
> plate current? Has anyone tried the 811-10 A2 amps? Any thoughts would
> be much appreciated.
>
> Best Regards,
>
> Robert
>
=========================================================================
From: Grover Gardner <groverg@postoffice.att.net>
Subject: Re: [JN] Zero-Bias SV 811-10/Dyna MK III Output Trans for SE?
Date: Fri, 25 Jun 1999 16:01:30 -0400
Source: Sound Digest Archive v02.n188
Chris Beck said everything I was thinking about this topic. I would only
add--if you're on a budget and have PP iron, why not build a PP amp with the
811s? There's a good circuit on the Svetlana web site, may be it's for 572s
but it could easily be adapted...
Robert C Chambers wrote:
>
> Hello-
>
> I'm very new to the list. This is my first post and a trial.
>
> Eric Barbour has written two articles in Glass Audio about using
> Svetlana's SV 811-10 in a zero bias, thus Class A2, power amplifier
> design. In the articles, he recycled a Dyna MK III chassis, power trans
> and indicated that one could use the output trans if it was undamaged,
> but that it would be better to use a One Electron UBT-2 (4.8K primary).
>
> I wrote a letter querrying him about the 811-10 exceeding maximum
> disippation at the quiescent condition, but I have never built the amp to
> find out for myself.
>
> If I don't have to, I'd rather not purchase a pair of UBT-2s because to
> do so would delay my entry to SE DIY by months, So...
>
> Has anyone used Dyna MK III outputs for SE? Any ideas as to maximum
> plate current? Has anyone tried the 811-10 A2 amps? Any thoughts would
> be much appreciated.
>
> Best Regards,
>
> Robert
- --
Grover Gardner
groverg@postoffice.att.net
=========================================================================
From: Tim Reese <tgrmail@nmr.MGH.harvard.EDU>
Subject: [JN] Zipped PS VALVE
Date: Sun, 7 Feb 1999 14:56:31 -0500 (EST)
Source: Sound Digest Archive v02.n032
At least one Joe responded to the offer of a zipped Postscript copy of the new
VALVE, so it's now on my website rabi.nmr.mgh.harvard.edu/~reese. Doc made it
clear that he doesn't want any hassles regarding this file (thus if it bombs,
send mail to me not him) but otherwise he grants his permission.
hth tr
- ----------------------------------------------------------------------
Tim Reese, MGH NMR Center reese@nmr.MGH.harvard.edu
=========================================================================
From: "Gary E. Kaufman" <gkaufman@bu.edu>
Subject: [JN] ZM1050, Z550M
Date: Tue, 5 Jun 2001 01:19:49 -0400
Source: Sound Digest Archive v02.n900
Anyone have any unwanted ZM1050 or Z550M Nixie tubes rolling around in a
drawer? I'd like to buy/trade for a few more. I'm "2 nixies short of a
clock".
Thanks,
- Gary
http://www.the-planet.org
=========================================================================
From: Remco Stoutjesdijk <remco@ultranalog.com>
Subject: Re: [JN] ZM1050, Z550M
Date: Tue, 05 Jun 2001 15:11:29 +0200
Source: Sound Digest Archive v02.n900
At 07:19 5-6-01, you wrote:
>Anyone have any unwanted ZM1050 or Z550M Nixie tubes rolling around in a
>drawer? I'd like to buy/trade for a few more. I'm "2 nixies short of a
>clock".
I don't I have any spare top readout types, but I do have a huge lot of the side view ZM1210 on stoc
k. Red shield, separate leads. Datasheet is at
http://www.ultranalog.com/data/ZM1210d.jpg
Contact me off list if you're interested.
Regards,
Remco
- --
http://www.ultranalog.com
=========================================================================
From: "Paul@13E1.com" <triode@bow-tie.org.uk>
Subject: [JN] Zonealarm
Date: Sun, 18 Jun 2000 11:34:43 +0100
Source: Sound Digest Archive v02.n584
At the recommendation of several Joes, I have loaded Zonealarm.
Now it may be that at some time or another it will protect me from some
ghastly virus and for this I am grateful.
Meanwhile, I have to say it is profoundly irritating - "Do you want......?"
Of course I do; that's why I pressed the button.
Looks like "Nannies 'R' us" and reminds me of that alleged response by GM to
Microsoft - "And an air-bag that asks "Are you sure?" before going off"
Paul
=========================================================================
From: David Barnett <d_n_b@swbell.net>
Subject: Re: [JN] Zonealarm
Date: Sun, 18 Jun 2000 13:20:53 -0500
Source: Sound Digest Archive v02.n584
On Sun, 18 Jun 2000 11:34:43 +0100, "Paul@13E1.com"
<triode@bow-tie.org.uk> wrote:
>At the recommendation of several Joes, I have loaded Zonealarm.
>Now it may be that at some time or another it will protect me from some
>ghastly virus and for this I am grateful.
This won't protect you from viruses. It's protection from
unauthorized probes into your computer.
>
>Meanwhile, I have to say it is profoundly irritating - "Do you want......?"
This will soon pass, once ZoneAlarm has been granted permission to use
all your access apps.
- --dnb
=========================================================================
From: "Paul Croft" <pcroft@iximd.com>
Subject: RE: [JN] Zonealarm
Date: Sun, 18 Jun 2000 15:50:51 -0400
Source: Sound Digest Archive v02.n584
Hi Paul,
Hmm, I wonder if you missed an option somewhere? Zone Alarm only asks me "Do
you want to..." when it is warning me that someone is probing my computer.
Then it asks if I want to continue to be warned when this occurs. I do, but
then it doesn't happen all that often. It is neat though; it also asks if I
want more info on the prober. If I respond in the positive it takes me to
Zone Alarm's web site and attempts to tell me who the intruder is. While
this is rarely successful in these days of dynamic IP addresses, it is
reassuring none the less.
By the way, I'm listening to Neil Young Unplugged while I type. It sure
sounds good. I built Avatar Audio's '281' kit last October, and they just
sound better and better as time goes by.
It is awfully hot 'n humid in Cecil County, Maryland today. The fan noise
doesn't help the audio - so I turned it up! I put ten miles on my kayak in
the Susquahanna River this morning. Then the sun came up. Ugh!
Well Paul, like I tell my customers, "Happy computin'"
Cheers,
Paul
P.S. Please lie to me. Winter is right around the corner, ain't it ma?
> -----Original Message-----
> From: owner-sound@lists.io.com [mailto:owner-sound@lists.io.com]On
> Behalf Of Paul@13E1.com
> Sent: Sunday, June 18, 2000 6:35 AM
> To: Sound@io.com
> Subject: [JN] Zonealarm
>
>
> At the recommendation of several Joes, I have loaded Zonealarm.
> Now it may be that at some time or another it will protect me from some
> ghastly virus and for this I am grateful.
>
> Meanwhile, I have to say it is profoundly irritating - "Do you
> want......?"
>
> Of course I do; that's why I pressed the button.
>
> Looks like "Nannies 'R' us" and reminds me of that alleged
> response by GM to
> Microsoft - "And an air-bag that asks "Are you sure?" before going off"
>
> Paul
>
=========================================================================
From: "Paul@13E1.com" <triode@bow-tie.org.uk>
Subject: Re: [JN] Zonealarm
Date: Sun, 18 Jun 2000 22:48:19 +0100
Source: Sound Digest Archive v02.n584
Paul,
thanks for that.
> Hmm, I wonder if you missed an option somewhere? Zone Alarm only asks me
"Do
> you want to..."
This was when I clicked on "Send"!
> Well Paul, like I tell my customers, "Happy computin'"
Thanks for the good wish, but to a good old Luddite like me, Happy Computing
is a bit of an oxymoron!
Thanks again for taking an interest,
Best wishes,
Paul
> Paul
>
=========================================================================
From: David Crittle <retrovox@bigpond.com>
Subject: [JN] Zonealarm
Date: Mon, 19 Jun 2000 09:22:54 +1000
Source: Sound Digest Archive v02.n584
>At the recommendation of several Joes, I have loaded Zonealarm.
>Now it may be that at some time or another it will protect me from some
>ghastly virus and for this I am grateful.
Any joes recommend an internet firewall for Macintosh?
critter
Tim Reese