[Test-Equipment] AN/PRM-10 Question

[Richard Knoppow]

     I recently got an AN/PRM-10 Grid Dip Meter, it worked 
OK when it arrived but had an intermittant of some sort. I 
got it to work and then it stopped altogether. The only 
thing I can find is that the cathode to ground resistance of 
the oscillator tube is wrong. This is a small choke going 
from ground to a pin on the tube. The book states this 
should measure 42 ohms in the resistance chart and "about 50 
ohms" in the text but I measure about half an ohm. I can't 
see how this choke could short, it appeas to be a single 
layer solenoid. I wonder if anyone knows for certain what 
its value should be or has an instrument and could measure 
it. I have only the handbooks from BAMA (the dejavu version 
is more complete than the PDF) which do not have a parts 
list to double-check the value. I would very much like to 
get this thing going. The odd part is that it actually 
worked at first but I had to open it to align the tuning cap 
and dial to get the frequency calibration on. I did that and 
after finishing dropped the probe after which it stopped 
working. The acorn tube is good, I tested it and made sure 
it was installed correctly. Any help would be appreciated. I 
can post voltage readings if desired.


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Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com