Tube Amp Archive

Thanks for the responses. I was putting together as much info as possible to help with the diagnosis, when I noticed on one of the photos that the VVR board has traces going to B+ on both sides. I used thicker gauge wire, and drilled out the holes, so alas both sides were no longer connected. Once I...

Hmmm, installation went well, or so I thought until test time. I'm not getting the full B+ out voltage when turned all the way up. I get the following readings: B+ In = 450V B+ Out = 150V Bias In = -47V Bias Out = -45V I assume this is close enough to be correct. When turned to minimum, the B+ Out g...

Hi All, Seeing as there's a fair bit of knowledge on the VVR installation on these forums, I'm hoping someone can help. I've got the B+ connections worked out, but am totally stumped where to connect the Bias points. I've attached a schematic, and have highlighted where the bias adjustment happens, ...