• 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.

Loose top caps.

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I've heard the expansion rate of the glue used for re-fitting the cap might be different from that of the glass, so eventually it'd crack around the new fixing. It's not a first hand experience, so that's for reference only. And please correct me if I'm wrong.

How about just remove the cap and use an alligator clip? :D
 
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