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insulation breakdown

between the heater and the cathode. This is a bane of these noval button base types. Who knows? The tube may not have failed on its own. Often they have help when this happens. You could try it with DC heating. Sadly even if you cure the gross hum you may find it has become a detector of all kinds of things the bad hum was masking.


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  • insulation breakdown - elektron 06/10/0915:34:00 06/10/09 (1)

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