It sounds as if your PV-7 could be leaking DC to the output, possibly a faulty cap that needs to be replaced.
Woofer thump when preamp comes out of standby
Hello all, just recently purchased a Belles 350a power amplifier here on audiogon. Placed it in my system and now I have thumping woofers as soon as my preamp comes out of standby to ready mode. The preamp is a conrad Johnson PV-7. The Belles replaced a pair of Cary SLM -70 monoblock tube amps. I had never had this problem with them. Any ideas what might be causing this problem? Would a dedicated 20 amp line to the power amp solve the problem or is this more of a ground loop problem? Also wondering if the preamp is inverting and the amp isn't, could that be the culprit? Any help would be greatly appreciated.
Thank you!
Thank you!