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Old 16th March 2012, 07:15 PM   #711
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Default Completed Build (Almost)

Final verison completed. Differenced from the stock PJM unit and build details are:
1) Power supply boards (CRCRC + Q-Speed diodes)
2) Tantalum resisitors in input section and RIAA filter
3) Audiocap Theta coupling cap + nuded Russion teflon bypass
4) Silver teflon signal wiring
5) Opamps directly soldered
6) Used Nichicon Muse caps for the IC supply bypassing
7) Used RJM's new buffer boards, inserted between the last IC output and the final coupling caps.
8) Measured and matched RIAA caps

After much meddling with AD797's I ended up keeping the OPA27 opamps in all positions. Cases are Modushop Galaxy.
Click the image to open in full size.
P1050528.jpg by MartinC7, on Flickr
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P1050526.jpg by MartinC7, on Flickr
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P1050530.jpg by MartinC7, on Flickr
Still burning in (only been running for 30 mins) but very sweet. With the volume full there is slighly less noise than the stock build, I am guessing that this may be due to the tantalum resistors.
Anyway back to listening then some final wiring clean up.
Cheers
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Old 16th March 2012, 09:59 PM   #712
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Richard Murdey
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That looks amazing...
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Old 17th March 2012, 01:33 AM   #713
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Thanks Richard, of course, it wouldn't be anyting of it wasn't for the work you put in designing the circuits, much appreciated.
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Old 24th March 2012, 05:29 PM   #714
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Quote:
Originally Posted by Mr Onion View Post
My first attempt at Electronics for years has produced this. Thanks to Richard for all his help.
The case for the PS and screen braid for the power lead have finally arrived, and I have managed to get it all hooked up and working correctly. Nice chunky 120va transformer with 8 Schottky Diode's in 2 bridges, case is from eBay The PhonoClone is in a Galaxy 10mm

Sounds rather good Shed loads better than my Dynavector P75 it replaced. Bass appears less deep, but its just an illusion as its cleaner and more precise, as it the whole or the spectrum. There's more detail, more 'space' between instruments, everything is better.

Overall its more precise, but not in an overly analytical way.

Yes, its staying.
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Last edited by Mr Onion; 24th March 2012 at 05:45 PM.
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Old 30th March 2012, 10:28 AM   #715
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... and its got a much greater dynamic range then the Dynavector P75 it replaced. Partially due to the 120va transformer I am guessing (the P75 is powered from a 500ma wall wart)
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Old 10th April 2012, 10:47 AM   #716
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A somewhat strange observation, that has to be linked to the PC3.

Using the Dynavector P75 and all previous phono stages, when playing music at 'realistic' (ie window shaking) levels my Power Amp got quite hot. Now I can play music even louder without distortion and the Power Amp barely gets warm.

Nothing else in the system has been changed.
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Old 10th April 2012, 11:03 AM   #717
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Fascinating. The only explanation I can imagine is the switching power supply of the Dynavector was throwing a ton of HF noise into the outputs-
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Old 11th April 2012, 07:58 AM   #718
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I wondered that as well, except that it it was the same with the NAIM Stageline powered with a linear supply I had prior to the P75.
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Old 12th April 2012, 04:28 AM   #719
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The Phonoclone is bandwidth limited by the opamps is it not? Perhaps Mr O has RF interference on the input side that is causing problems with stability on the power amp with other stages but benefits from the inherent filtering in the Phonoclone?
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Old 12th April 2012, 08:17 AM   #720
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Good point. I do suffer from RFI problems here. I have put a few turns of the arm lead through a ferrite ring to stop radio pickup on previous phono stages (its still there as I haven't been bothered to see if I still need it on not) and I still get 'thermostat switching' noises through the system.

I have managed to diminish it somewhat by putting caps across the PC3 input and output. I have yet to try one across the power pins of IC1 as Richard has suggested.
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