Tube Amp Archive

looks like the B+ in, is wired wrong, or you have an another wire going to high B+, going to the dropping power supply resistors. high B+ should just have one wire going in.. then one wire coming out of the board to High B+ in the amp. thanks for the response. if i was trying to scale the whole amp...

Main volume 4-5. PPIMV full to half. I swept the VVR from max to min with no noticeable effect. I was expecting some volume drop even at 4-5. For example: I just installed a Power Scaling Kit from London Power on a 100 watt plexi and it worked like a charm. Scaled evenly up and down the pot. Even we...

Hello All,  My first post here.  I just installed a fixed bias VVR into a 50 watt plexi (1987x circuit).  The amp came to me as a pre built clone with a PPIMV already installed.  I installed the VVR as per the VVR3 instructions.  All the voltages track as they should (I think).  However, at full VVR...