OK, Garey-I checked the meter, and it showed .16 volts thru the connections on the 
back of the housing.  The shunt resistor measures 3.1 ohms in circuit, and 3.3 ohms 
out.  Using the 3.1 ohm figure, that would make the actual current around 52 mA.  This 
is with the pot on the back of the AC-4 set to read an apparent 70 mA on the meter.  
Assuming my cheapie DMM is anywhere near accurate, I am seeing a significantly higher 
appparent vs actual plate idle current reading.  I looked through the T-4XB manual, 
and did not find anything specific as to meter calibration.  What is the usual cure 
for this situation?

On the bright side, the AC ripple in the transmit signal is now gone with the 
replacement of the old C4 cap in the AC-4 PS.

73,

Don, W5EI
Troup, TX    
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