Either bad luck and coincidence getting three bad tubes, or THIS: On Wednesday, August 17, 2016 at 7:56:44 AM UTC-7, Nick wrote: > > Either it's a mechanical issue with the socket stressing the pins to the > extent the tube eventually becomes leaky.... > > ...or it's to do with the anode driver (the cathodes share the same drive > across all tubes) - either the anode resistor has failed in some way (or > isn't the correct value) or the opto-coupler is leaky/faulty (but I'm not > sure how that would cause premature tube failure) >
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