• 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.

Integrated amp will not turn on

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I have a Sonic Frontiers Integrated amp that decided not to turn on this morning. There is power, the fuse is good, the switch is good. Where do I go from here to find out why I am not getting power. I checked at the diodes high voltage and I have nothing.

Thanks,

Mark
 
OK, primary circuit is good. Move over to the secondary and check for continuity, you should disconnect the secondary leads to get an honest reading. If that's OK, check the rectifier diodes (use multimeter diode check function) with the transformer leads still disconnected. If those are OK, check all connections in the power supply circuit to make sure there aren't any bad ones.

Mike
 
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