Look in the amplifier for a board that is in the front left corner of the
cabinet.
You will find 2- 5 watt resistors. One is for the Grid Current metering, the
second
is for the plate current, each are .3 ohms, one is plate metering shunt, the
other
is grid shunt.
The meters are actually configured as voltmeters and measure drop across the
shunts,
in that way when the shunt opens a short flame does not appear in the meter
case. The
grid meter is in the HV return lead (- volts) that's why the meter is acting
as it is.
Parts are available from Mouser.
Good Luck, we're all counting on you.
73!
ed K0KL
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