• 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.

is it busted?

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just wondered if this el34 is ok? its from a kit ive nearly finished,the others are silvery on top but this one has a white powder on most of the top,and small bits of white dust inside,theres no obvious signs of damage to the glass.should i just hope for the best and use it or get a replacment?
 

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