His Master's Noise: A Thoroughly Modern Tube Phono Preamp - Page 21

21st April 2010, 12:00 PM
SY On Hiatus Join Date: Oct 2002 Location: Chicagoland	His Master's Noise: A Thoroughly Modern Tube Phono Preamp After more than 25 years of faithful service, it seemed that it might be time to redo my phono system. After all, I like to think that I've picked up a few tricks in the intervening years... The old system consisted of a VPI HW17-II, a Linn Ittok LVII tonearm, and a Troika cartridge. The Troika was... Click here to read the entire article Last edited by Variac; 2nd April 2011 at 12:17 AM.

19th May 2015

piano3

diyAudio Member

Sy, am I correct in thinking that you designed this phono amp for Technics EPC-305-MC?
If so could you please remind me of the tracking weight and confirm that the DCR is 15 ohms. I haven't used mine for over 20 years and I've lost the paperwork which originally came with it. I only used it for a short time as the amp I owned then had a very noisy moving coil input. In fact, it's the only LOMC I've ever owned; I bought it at great discount when I was a student.

19th May 2015

On Hiatus

I've used it with the Technics and with a Denon 103R. Yes, 15 ohms (measured). I set tracking at 1.5 gram for the Technics.

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

19th May 2015

piano3

diyAudio Member

Many thanks Sy.

19th May 2015

On Hiatus

Je t'en prie!

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

18th June 2015

Freecrowder

diyAudio Member

Just came across this article yesterday. Timed perfectly i have been looking for a high performance Phono Pre. I recently purchased a Denon 103R and am running it into Cinemag XfMR's and a Bottlehead phono pre. I was astonished of the complete lack of noise through the XFMR's. Any way to get to the point are there still a set of complete boards out there for purchase??

3rd July 2015

luvdunhill

diyAudio Member

Any problem performing the Vhk lift in the PSU chassis off the unregulated HV line?

11th July 2015

On Hiatus

The Vhk lift is pretty noncritical, so go for it!

Freecrowder, have you contacted Jack Walton at tech-diy.com? He had boards made and I've been very happy with them.

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

22nd October 2015

TUBESMAN

diyAudio Member

Sy, a quick question about the FETs. I'd like to know the voltage dropped across each of them so I can size the heat sinks properly. And pick the right package. TO220 may not be needed in all spots. But if it is, well, that's OK too. Thanks!

Dedicated to the proposition that man's innate thirst for knowledge will someday overwhelm his passionate lust for stupidity.

22nd October 2015

On Hiatus

The "lower" FET has just a couple volts across it, so its dissipation is close to zip. The upper one will have 50-80V across it (depending on which stage), so is perfectly fine with a small heat sink that can get rid of a watt or two.

"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

22nd October 2015

TUBESMAN

diyAudio Member

By lower fet you mean the one closer to the tube or ground? Right? Thanks!

Dedicated to the proposition that man's innate thirst for knowledge will someday overwhelm his passionate lust for stupidity.