• 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.

Little dot 2+, got spark

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lawrencechin

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Joined 2010
Now I am using little dot 2+ tube headphone amp. Every time when I turn ON the amp ( power tube= 4p1S still cold), it have blue spark inside the tubes, output I can loud "POP". If the tubes is already hot, turn off and turn on, it won't happen, only happen when the tube is in cold condition. Even I have changed to few pairs new tubes, problem same, is any part spoil? Anyone know whats the problem.
 
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