• 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.

end of tube

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#22
Sounds like you are over-voltaging the tubes during power up.. Note that some Mullard ECC83/12AX7 are quite prone to bright flashes at power up and note also that these are the only ones I have EVER seen with open filaments. I have ruined several over the years this way...

Kevin
 
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