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Old 27th September 2009, 05:25 PM   #21
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It's best to order them directly from the source: http://www.v-cap.com/tefloncapacitors.html Notice the discount for 2pcs or more.
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Old 27th September 2009, 05:33 PM   #22
hayenc is offline hayenc  United States
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Worked great. Thanks Peter.
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Old 27th September 2009, 05:37 PM   #23
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And don't forget to break them in

http://www.diyaudio.com/forums/parts/152329-breaking-teflon-caps-post1931175.html

Although I never did it with mine; they seem to work fine right from the start.
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Old 28th September 2009, 02:06 AM   #24
cyxg is offline cyxg  Australia
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Quote:
Originally Posted by Peter Daniel View Post
I'm sourcing MJE1530x from Digi Key. All op-amps have SMD pads already.
beautiful PCB!
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Old 28th September 2009, 02:36 AM   #25
toufu is offline toufu  United States
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Peter, what's the gain for the phono amp? Is it for MC or MM?
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Old 28th September 2009, 02:58 AM   #26
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It is for MC with 75dB gain.
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Last edited by Peter Daniel; 28th September 2009 at 03:16 AM.
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Old 28th September 2009, 04:43 PM   #27
toufu is offline toufu  United States
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Is it easy to modify the circuit to lower the gains to work with MM cartridges? Or are you planning to design an MM version of the circuit?
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Old 28th September 2009, 04:55 PM   #28
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Is it easy to modify the circuit to lower the gains to work with MM cartridges? Or are you planning to design an MM version of the circuit?
I doubt it...

Peter's original postings indicate that it is his version of the Phonoclone which in turn was inspired by the 47 Laboratory Phonocube. The low gain version of the Phonocube is 75db, the high gain is 90db and the overall gain achieved is wholly dependent on the cartridge impedance.

You can read about it here:

http://sakurasystems.com/products/47phono.html

but the details are sketchy. I had a Phonocube for a year or two about 8-9 years ago and it remains in my mind as one of the best sounding phono stages I have ever heard. It was also the quietest which is a big deal as far as I'm concerned.
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Old 28th September 2009, 05:16 PM   #29
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To be precised, it is my implementation of phonocube circuit. AFAIK, it is exactly same schematic, I'm just using different part choices and different PS. The circuit is different from the phonoclone popularized here, and based on some comments from people who built both, it's also better sounding. With proper selection of opamps, it does not require output coupling caps (offset stays below 2mV if you are lucky, on average it is below 10mV).

To get idea on the sound, you may read this review (of the original product): http://sakurasystems.com/reviews/reviews9.html

I wasn't much into vinyl myself and I always though that well done digital playback system can equal analog. After listening to this phonostage in a well assembled analog rig (modified Versa Dynamics with ZYX Universe silver) I now simply don't think it's possible: the vinyl is so much better
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Old 28th September 2009, 05:28 PM   #30
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mmm. Now I'm just going to have to build this one. I've had a couple of iterations of RJMs phonoclone and also a pass pearl with lundahl step-ups so I think this would be a good one to add to that mix. Gonna have to sell some of the other though. 5 phonostages is just excessive!

Fran
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