I have an old amp with 813's in grounded grid. All grids are grounded
directly. To cut the tubes off during standby I raise the center tap of
the filament transformer above ground. There is a resistor to ground
that stays during standby.
There is about 2600 volts on the plates at standby. There is a small
amount of plate current indicated. I think around 20 ma.
I am going to raise the plate voltage to around 3000 or so.
I am assuming that the standby current I am seeing now may be plate to
grid or plate to screen current?
Is there a more preferred way to cut those tubes off during standby?
Thanks
Gary K4FMX
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