• 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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Blue glow

Not sure were to put this but here it is. I aquired 3 Dynaco MK3 and 2 MK2
from a basement. I have rebuilt two of them but get a blue glow in one tube.
it isn't a reflection as I first thought. Any ideas?
 

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