I guess shortened the life of the tube....
From this being discussed in many threads it seems the consensus is for the voltages involved with our typical audio circuits you have nothing to worry about with shortened life.
In some cases it depends on the tube. eg 6C33c power tubes. They really benefit from being at full temperature prior to running hard. So in this case I installed a separate power switch to the B+ to allow filaments to heat for 5-10 mins prior to use. Result is very stable tube that many find unreliable. On small signal tubes however, no issue just slamming on the B+ with the filament on a cold tube.
Well, that's one persons opinion, not mine.
As i find no documented case where audio tubes has been damaged by
applying B+ simultaneously with filament i see no reason to delay B+.
On the contrary i have seen and read about problems injected by various
delay things , then i find these devices harmful when misused, and makes no
difference when implemented properly.
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