no quiescent current flows through the grid that probably had went away from the tube pin. such tube will do nothing and you probably should hear channel volume difference.
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I would guess that the pin for the plate is burned out but the heater elements are lighting up. Note that each pin on a tube provides a different function. This tube is most likely not drawing any amperage.
I would recommend getting a reasonably priced tube tester that checks for shorts and transconductance.
Point well taken.
However, a decent tube tester can be had for under 200 on Ebay, if someone does some basic research. I picked up a nice unit that has allowed me to check the condition of the tubes in my ARC / BAT equipment. I also discovered a shorted 7308 tube that could have eventually caused a problem in my amp.
The ASL Hurricaine contains a total of 22 tubes (16 KT-88 & 6 6SN7's. I would want a way to check for the condition of these tubes periodically in a reasonable amount of time.
Nice amp, I just heard it over at Holme Audio (Chicago area) hooked to to a pair of Coincident Totals.
Anyhow, just my opinion - love this hobby - the opportunity for new stuff never ends. Sorry if I blabbed too much.