Sound Practices Mailing List Files - Volume 1
========================================================================= From: "Doc B." <bottlehead@silverlink.net> Subject: Re: X-Dac 3.0 Date: Tue, 1 Dec 1998 07:35:31 -0800 Source: Sound Digest Archive v01.n511 Love it. Mine was built from the "board and parts" kit, has a few tweaks by Tucker (shunt regulated DAC and a BG cap here and there), comes directly off the DAC chip to the input of my line stage, and has a toroidal power trans feeding a CLCLC PS going into three pin pregulators. It's superb, my only beef as of late is that it's a bit noisy in the inverted mode, but this is more likely due to constructor brain damage than a design flaw. Doc B. www.bottlehead.com - -----Original Message----- From: Christian Rintelen <rintelen@datacomm.ch> To: Joenet <sound@lists.io.com> Date: Tuesday, December 01, 1998 1:58 AM Subject: X-Dac 3.0 >Joes, > >do any of you have experience with Norman Tracy's X-Dac 3.0? (I need a >new DAC and his concept looks good.) > >TIA for your 2 cents > >Christian > ========================================================================= From: Christian Rintelen <rintelen@datacomm.ch> Subject: X-Dac 3.0 Date: Tue, 01 Dec 1998 10:16:16 +0100 Source: Sound Digest Archive v01.n511 Joes, do any of you have experience with Norman Tracy's X-Dac 3.0? (I need a new DAC and his concept looks good.) TIA for your 2 cents Christian ========================================================================= From: "Thorsten \"EZEE\" Loesch" <tloesh_2@globalnet.co.uk> Subject: X-Former (Mains) Question Date: Fri, 29 Aug 1997 11:20:58 +0100 Source: Sound Digest Archive v01.n004 Hi all, While this is not strictly Glassbottle Audio, I'm trying to find a source for Toroidial Mains Transformers (with UK/European primaries). Now that in itself is no problem, the problem is that all X-Formers I have found so far are "low-profile" units which are comparatively large in diameter but not very high. I cannot uses these unfortunatly, as the Units will have to fit into pre-allocated Spaces. In a number of comercially made Electronics I have seen "tall" Toroidial High Power transformers. these are usually about as high as they are wide. Does anyone know any source at all for these? Kind regards Thorsten. ====================================== e-mail: Torsten.Loesch@enhar-ha.nthames.nhs.uk Disclaimer: The opinions expressed herin are my personal ones and do not in any way reflect opinions or policies of my employer. web-pages: http://www.users.globalnet.co.uk/~tloesh_2 ====================================== ========================================================================= From: Jeremy Epstein <jepstein@shwd.com> Subject: Xmas without tubes Date: Wed, 23 Dec 1998 14:33:06 -0500 Source: Sound Digest Archive v01.n550 I need help, Joes! You have all indulgently heard at great length my saga of building, and experimenting with, a "Bob Danielak Darling" 1626 pushpull stereo amp. Bob kept suggesting I listen to it single-ended, which I hadn't liked given an unfair trial (ripply power supply, and using only half the IT secondary and OPT primary windings : basically just pulling a tube from each channel.) I gave it a fairer trial (thanks to Ronan the Barbarian for the nice 8H choke!) by rebuilding the power supply and rewiring the trannies properly. Using one 1626 per channel, it was a little light in the loafers, but parallel single-ended, that was the ticket. It sounded great. But it was built into a disgusting messy salvaged chassis. I made the decision to transfer it over onto a nice brass chassis (remember those door kickplates I had mentioned here?) so it would look nifty for the guests who are coming on Christmas Day, solely to listen to my stereo. And to eat and to drink and to be merry, too, I guess. The new layout, the identical circuit to the setup I was enjoying so much, motorboats like crazy. The key differences between the two versions are as follows : the new one has a much more dense layout, also components are on one turret strip instead of distributed to terminal strips at different points, also IT and OP transformers are under the top plate instead of atop it, also the 1626's for each channel are mounted in the same orientation instead of being perpendicular to each other. It LOOKS a whole lot nicer, even without the woodwork for the base. With the guests coming soon and my wife losing patience, where do I look first? I was going to try reorienting the trannies first, then maybe putting them on top. As a troubleshooting indication, the motorboating stops when I touch a 1626, but even when it's not audible during silence, it modulates the signal and sounds like real garbage. I have already tried the following : seperating the power stage grounds from the driver stage ground, resoldering the 1626's socket's pins, connecting the 12V heater center tap to ground, reconnecting it back to the cathode of one set of 1626's, moving the cathode bypass caps for the power tubes further away from the driver's cathode resistors/caps, moving the plate supply wires around. It seems to be slightly worse than when I started. @#$%%^&! Help! I don't want to have to rig up my solid state amp for Christmas, for Pete's sake (and Christ's!) - -j - -- ===================================== Jeremy Epstein .... jepstein@shwd.com ===================================== ========================================================================= From: Grover Gardner <groverg@postoffice.att.net> Subject: Re: Xmas without tubes Date: Wed, 23 Dec 1998 17:19:38 -0600 Source: Sound Digest Archive v01.n550 I would suggest you check the following: Ground connections and scheme. B+ supply--by any chance did you hook up the input and output stages out of order in the B+ chain? Do you have a shared B+ supply between the two channels? Try more decoupling in the PS. This assumes you have adequate decoupling to begin with. Try disconnecting one channel from the power supply at a time and see if one or the other motorboats on its own. Check all your caps, including bypasses, for correct polarity. I wonder if the brass plating is preventing a secure connection to ground. You might scrape some off around your ground points (should be at the input only, right?) and see if this helps. Keep us posted. Grover Gardner groverg@postoffice.att.net ========================================================================= From: andre@indigo.ie (Andre Jute) Subject: XO points for voice matching Date: Tue, 30 Sep 1997 12:42:11 +0100 (BST) Source: Sound Digest Archive v01.n049 At 11:57 pm 29/9/97, GREGORY MONFORT wrote: > I personally don't want the subs to play into the >vocal range as deep bass will 'color' voicing when played at 'live' levels. Gregory, if you could reach out and take speakers of ideal spec off the shelf to match your idea of how music should sound, where would you choose to cross over from sub to woofer, from woofer to mid, from mid to tweeter? Andre Andre Jute andre@indigo.ie Communication Jute the main index to the pages we support for lovers of classical music, for writers, and for audiophiles is at http://www.foundmark.com/ComJute/ComJuteF1.html ========================================================================= From: "GREGORY MONFORT" <WINGRACER@classic.msn.com> Subject: RE: XO points for voice matching Date: Tue, 30 Sep 97 13:06:12 UT Source: Sound Digest Archive v01.n049 I'm pleased with my system's active crossover points of 80 hz @ 18 db/octave, 500 hz @ 12 db/octave, 5000 hz @ 6 db/octave. GM - ---------- Gregory, if you could reach out and take speakers of ideal spec off the shelf to match your idea of how music should sound, where would you choose to cross over from sub to woofer, from woofer to mid, from mid to tweeter? Andre ========================================================================= From: "blackie" <blackie@mail.infohouse.com> Subject: Re: xxxxxxxxxxxxxxxxx Date: Wed, 15 Apr 1998 07:04:09 +0000 Source: Sound Digest Archive v01.n252 > Date: Wed, 15 Apr 1998 08:14:38 -0500 > To: "blackie" <blackie@mail.infohouse.com> > From: bill gardner <wg44929@navix.net> > > Hi Blackie , what it is , welcome . I'm the guy JC > warned you about , just kidden . > Best regards Bill Gardner Hey Bill Just tryin' to get the scoop on this list type stuff Hope you found my first post informative, har har L8R Blackie blackie@tubesville.com
Tim Reese