• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

How do I go about repairing a vintage Pilotone AA-410A monoblock tube amp?

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I bought a pair not too long ago one works fine but the other one was labeled 'dead'. I replaced the burnt fuse and turned it on. The tubes lit up but after about 10 seconds there was a blue flash and the fuse burned up again. Does somone know what the problem is?
THanks....
 
I would imagine you need to replace all the power supply and signal capacitors (basically all capacitors) in BOTH amplifiers for reliable use.

You should also replace out-of-spec resistors, and weak tubes.

You might have a shorted rectifier tube. However the power supply capacitors are the most likely cause of this.
 
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