I am of the belief that tube failure is directly related to the amount
of alcohol consumed by the operator while operating the amplifier.
The only tube failure I can recall being involved in was when I removed
one of the 3-500Z tubes from an amp to clean the dust out and laid it on
the workbench. Tubes are round and it rolled off the bench. Being
quick\-footed, I broke the fall with my shoe and the glass did not
break. Unfortunately, the filament did. Lesson learned. Electron flow
ceases when the filament breaks. And, no I had not been drinking.
73, Colin K7FM
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