Davide, you can talk to Ed at C/J customer service. He is a super nice guy. They probably have mods for that unit. Replacing coupling caps is probably a good idea especially if you are seeing swelling end caps or the caps are not blocking DC voltage. Odd a cap would say ARC on it as that sounds like an old Audio Research part. Maybe this was a prototype...Since coupling caps are like speaker wire and interconnects in that they act like tone controls, it's a rather subjective thing. I was never a big fan of the old m.i.t. caps but again it's just my personal experiences with them.
Conrad Johnson PV-10A mod experiences?
Has anyone had experience performing a mod on the CJ PV-10A? I'm fond of this preamp, it has that wonderful tube openness and sweetness for harmonics. However over the past 6 months as I've delved into PC audio and DAC improvements, I've come to realize two things about it
1) its slow on transients
2) its dynamically compressed.
I'm using Mullard NOS tubes throughout as these seem wonderfully detailed with excellent base.
Since the preamp is built like an engineering prototype (overbuilt)my gut hunch is that some caps have aged (circa 1993)and need replacement, specifically the white CJ caps
and am thinking about replacing them first with Multicaps.
Wondering if anyone has experience trying to revitalize a PV 10A?
1) its slow on transients
2) its dynamically compressed.
I'm using Mullard NOS tubes throughout as these seem wonderfully detailed with excellent base.
Since the preamp is built like an engineering prototype (overbuilt)my gut hunch is that some caps have aged (circa 1993)and need replacement, specifically the white CJ caps
and am thinking about replacing them first with Multicaps.
Wondering if anyone has experience trying to revitalize a PV 10A?