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RE: OK- its an older 12-tube model

Just to make sure it was not the tubes, I swapped all the tubes from the poorly functioning amp to the one working well and vice versa. Still got the 2v offset reading on the left and still got a pinned to zero reading on the right. Sound wise still have the powerful right as compared to the left.

Pulled the tubes and measured the grid voltages on grid 2 to chasis and got 410 on both rows. Tried readings comparing anodes to cathodes and grids to both on standby and fully on and despite small or drifting values as the amps warm up there is little difference between them and the readings are almost the same as the functioning amp. I only tested the two end tube sockets of each amp and maybe it would be different if I tested all the sockets.


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