i have installed a 100k alps, should i be using a 250k?
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thanks for the reply ... one thing i was wondering as well, i have read in a few posts that the original pas3 requires a 250k volume pot to preserve the original phono riaa. i have also read that using a 250k can produce a lighter tone with possibly a bit more air compared to using a 100k, which can tend to sound a little darker. is any of this true?
I don't think 100K is the original value pot. for a PAT 3. Still though, shutting off at full volume looks like a defect and not caused by the wrong value pot. You really should stick with the orig. value to retain the Dynaco's sonic signature. Go to DIY audio's site, or Audiokarma. The people there can probably tell you more than you ever cared to know about this.
There is no such thing as a Dynaco PAT 3. There is a PAT 4, PAT 5, PAT 5 bifet, PAS 2, PAS 3, PAS 3X and PAM 1 for the Vincent Van Gogh crowd, but no PAT 3. Panor made PAS 4 or some such hokum as well.
The answer to your question is dependent on the output impedance of your sources, and most sources in common use today will not have any issue working into 100K or 250K loads. So it really doesn't matter.
All of the PAS preamps came with 250K standard and working into the lower load would not change the RIAA, but might roll off the bass a hair.
For what it's worth, I use a 100K Alps pot on my PAS3 and it works fine, my PAT 4 still has the original pot and it works nicely as well.
If you would like to hear a large improvement in the PAS, bypass the tone controls and filters, particularly that horrible blend thing. Beefing up the power supply helps a lot as well. And the mod that subs the LED for the light bulb made my trannie run cooler. YMMV and good luck.