• 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.

Weird "holes" in getter

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Hi,

I have noticed some weird "holes" in the getters of the power tubes (6N13S) of my amp. The holes are only visible if I hold the tube against light. I have not noticed such patterns on any other tubes, though I do not have any other big tubes in use.

Is this normal or a sign of some problem (too hot, too high voltage etc)?
 

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