One of my MkIII monoblock amps made a loud 'pop' and then went silent. After some basic diagnostics (power tube swap, changed the rectifier) I found that the V1 power tube socket would not bias correctly with either of the two tubes. Voltage readings got up to around 45vdc!!! The corresponding 10 Ohm bias resistor looks fine (not burnt) but measures zero! V2 resistor measures fine at 10 ohms. Couple questions:
What causes the resistor to fail?
Did the high bias voltage damage the power tube or anything else?
What type and wattage is the resistor and where can I buy some replacements?
Thanks in advance,