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Old 21st April 2010, 12:00 PM  
SY is offline SY  United States
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Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Default 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...

Last edited by Variac; 2nd April 2011 at 12:17 AM.
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24th July 2010
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sonidos
Libertador de la Música
diyAudio Member
I live approximately six miles from SY and after several months, we finally had time for personal introductions and I spent a rewarding evening listening to SY's 'Noise'. We got down to business right away. We switched liberally between CD and vinyl. Fortunately, no brain probes were involved. Lucky me!

If anyone has inquiries regarding buzzing, hissing, humming, or downright rude noises coming from his concoction, let me lay all doubts to rest. It was quiet. VERY quiet. Now I did not go to the speakers and lay my ear next to either one, but I never listen that way!

So I ended up having to fight the urge to drool because the music was very enjoyable and SY can attest that my full attention was on the music. In conclusion, I will do everything in my power to convince SY to finish his MM version. My guess is that it would make some great noise in my personal system!

Thanks, SY for the invitation!
24th July 2010
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SY
diyAudio Moderator
Delighted to have you over! Having Stevie Ray Vaughn albums tucked under your arm was a sure sign of class.

Your Rega will be a perfect guinea pig (non-Peruvian) for it.
"The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous."- H. L. Mencken
24th July 2010
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Pano
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They eat Guinea pigs in Peru, so be careful!
24th July 2010
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sonidos
Libertador de la Música
diyAudio Member
I know Pano! My wife is Peruvian.

SY just wants my ears and the audio interpreter between them. gulp!
12th October 2010
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jackinnj
diyAudio Member
I'm thinking something like this -- the board splits in half (use your band saw or some aircraft snippers):

20th October 2010
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jackinnj
diyAudio Member
Here's HMVS on a PCB -- the Sowter trafos not yet mounted:



22nd October 2010
Skorpio
diyAudio Member
Very nice article, thank you!

Any reasons for using the output buffer instead of taken the output from the source of the lower DN2540 at the CCS second stage?
22nd October 2010
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SY
diyAudio Moderator
That's another valid design path which I didn't explore. I like esthetically to use tubes exclusively as the signal amplifiers in this design, there's an extra tube section available, and I've had great luck with ECC88 cathode followers. But one might get an equally excellent result using (effectively) a source follower. The downside is that it reduces the effective plate load, though I suspect not enough to materially affect the circuit performance (haven't measured or simmed the effect of the load shunting the source to ground).
"The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous."- H. L. Mencken
22nd October 2010
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luvdunhill
diyAudio Member
SY, I was surprised about how dead quiet this thing was last night, combined with the tube headphone amp I brought. I cranked the thing with the needle up and couldn't hear a thing over the din of the party. Amazing!
22nd October 2010
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SY
diyAudio Moderator
Unfortunately, the headphones you left here totally spoiled me. I had been getting by with some cheapies but now... dammit.

Your 'phone amp sounds excellent, BTW. I will need to study this at length.
"The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous."- H. L. Mencken

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