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Old 25th July 2011, 12:09 PM   #311
slawney is offline slawney  Germany
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Connecting the tone arm cables directly to the INPUT pins of the first OPA without using an intervening RCA cable to join TT and phono-stage is the best way to use this circuit. The currents and voltages involved on the input are so small, that degradation occurs very quickly with RCA sockets, RCA plugs, long cables, etc. Once I removed the RCA plugs between TT and phono-stage, it was as if I moved from row 15 to row 3 of the concert hall.
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Old 25th July 2011, 12:58 PM   #312
Carlp is offline Carlp  United States
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Sure seems like hum pickup from the TT motor would then increase dramatically. But it sounds like not in your case, slawney? Nor yours 04dgmsilv?
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Old 25th July 2011, 02:08 PM   #313
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Quote:
Originally Posted by Carlp View Post
Sure seems like hum pickup from the TT motor would then increase dramatically. But it sounds like not in your case, slawney? Nor yours 04dgmsilv?
None whatsoever, surface noise even from my cleanest albums dominates any remaining noise from this circuit. With the cart off the record, I only get some 'ocean surf' around 2-3 o'clock on the preamp dial, which is insanely loud in my system and some of that is certainly attributed to my tube preamp.
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Old 25th July 2011, 02:40 PM   #314
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Quote:
Originally Posted by 04dgmsilv View Post
Finally got around to taking a few pictures of the phono stage that Peter put together for me a while back.
It was s tight fit and a bit tricky to assemble, but I'm glad it worked out fine. Here, some more pics of the inside:
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File Type: jpg 4.jpg (187.4 KB, 383 views)
File Type: jpg 3.jpg (190.4 KB, 377 views)
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Old 25th July 2011, 10:54 PM   #315
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I don't actually think that it's a problem with the phono stage, because I actually took it over to a friends and tried it as well - same thing...this is not a slight hissing sound, but something you can hear very prominently, even with music playing.
I think I got taken ordering the OpAmps from ebay (china) and have put in a new order for 627AP/637AP from Digikey.
The fact is that I was completely satisfied with the amount of noise before (which truthfully was non-existent IMO)
Byron
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Old 26th July 2011, 04:40 AM   #316
le´flu is offline le´flu  Germany
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Hi Peter,
this really compacted version of the phono looks
really nice. Connectors are from lomo right?
Is this an upgraded version? Because in the original
circuit there is one 100uF BG for two opamps each
channel, in the picture i see one BG each op.

Greetings ulf
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Old 26th July 2011, 02:32 PM   #317
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Yes, the signal comes through LEMO, PS connected with Neutrik.

The reason we see dual caps is because the circuit uses separate PS for each channel.

BTW, the board was also optimized for dual mono application as explained here: The Phono Stage
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Last edited by Peter Daniel; 26th July 2011 at 02:38 PM.
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Old 26th July 2011, 03:28 PM   #318
Salas is online now Salas  Greece
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Peter, are those Tx less offensive than EI for hum field in practice? Should project from their core corners for one.
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Old 26th July 2011, 07:41 PM   #319
le´flu is offline le´flu  Germany
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Hi Peter,
looks great, as usual ;-)
BUT i always thought that those high quality constant-current/ shunt
psu´s should be as close to the load as possible... did you do any
measurements or listenings between close to the load and in
different cases?

Greetings ulf
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Old 26th July 2011, 08:37 PM   #320
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Yes, we actually did, and the best performance is gained with custom umbilicals built in a similar way as quality interconnects; such setup sounds actually better than PS connected directly to the preamp.
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