08-29-2021, 07:01 PM
I am refurbishing a model 60 B. All tubes replaced as well as capacitors ( excluding mica capacitors ) Attached is the schematic, and results of the voltage readings at the tubes on Table 1. As you can see there are no volts at most of the plates and grids except tube 80 reading 330 volts. All filament volts are okay Table 2 has the power transformer data and while terminal 3-5 is only 3 volts the plates at tube 80 are 750 volts. Tubes 42 and 80 light up but not so for the other tubes. Needless to say there is no sound. Any Thoughts?
