• 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.

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An interesting night-time view of my double quad 6550 2x115W amp. A couple of tubes nicely have a very strong flourescent blue on the inner envelope, why don´t the others show the same when all tubes are well matched ? trace impurities ?

Bench Baron
 

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