Thanks to all so far for responding.
Sns, it indeed is the Jadis I am thinking of working on. I am not nearly as comfortable with DIY as I would like to be.
Atmasphere, thanks for chiming in. The pre is a Jadis JP80, and it sounds wonderful as is, but I can hear where it is a bit off the mark vs other things I have had in my systems so want to try that. Without having schematics, I am a bit worried about going in myself (actually, with schematics, I am a bit worried about going in myself), but in this thread I am trying to learn which approaches will get me what I want. The pre has a separate power supply, which is beefy, and I have never felt it to be lacking. I think it is perhaps the main strength of the pre. I do not know how it is regulated. The newer versions are tube-rectified. At some point in the past, the power supply was SS. According to Arthur Salvatore's website, that started in 1990 and lasted a few years. Mine is a single-digit serial number, which would suggest it was before Jadis went SS, but since the aluminum cylinders in the back of the PS have covered tops, and I have not looked under the deck, I do not know if they are caps or completely enclosed tubes (and I am too much of a circuitry innards neophyte to have any confidence about what I see other than transformers, glowing tubes, resistors, and clearly marked caps (and, of course, I can usually tell what wire is)). Are "filter caps" the output coupling caps? And last question, would you suggest using a small cap in parallel as a shunt cap, as some do?
Sns, it indeed is the Jadis I am thinking of working on. I am not nearly as comfortable with DIY as I would like to be.
Atmasphere, thanks for chiming in. The pre is a Jadis JP80, and it sounds wonderful as is, but I can hear where it is a bit off the mark vs other things I have had in my systems so want to try that. Without having schematics, I am a bit worried about going in myself (actually, with schematics, I am a bit worried about going in myself), but in this thread I am trying to learn which approaches will get me what I want. The pre has a separate power supply, which is beefy, and I have never felt it to be lacking. I think it is perhaps the main strength of the pre. I do not know how it is regulated. The newer versions are tube-rectified. At some point in the past, the power supply was SS. According to Arthur Salvatore's website, that started in 1990 and lasted a few years. Mine is a single-digit serial number, which would suggest it was before Jadis went SS, but since the aluminum cylinders in the back of the PS have covered tops, and I have not looked under the deck, I do not know if they are caps or completely enclosed tubes (and I am too much of a circuitry innards neophyte to have any confidence about what I see other than transformers, glowing tubes, resistors, and clearly marked caps (and, of course, I can usually tell what wire is)). Are "filter caps" the output coupling caps? And last question, would you suggest using a small cap in parallel as a shunt cap, as some do?