• 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.

Speakers not connected on tube amp, good or bad?

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#21
consider that the speaker connected to the secondary of the tube OPT reflects that as load to the primary...
ow with signals present and not speaker loads, then high voltage builds up and cause insulation breakdowns, hotspots and the primary wires of the OPT fuses...
something likes these is the result...



 
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