A Challenged Challenger

[Alan W. Fremmer]

Fellow Collectors/Restorers,
 
I need your thoughts on this Viking Challenger.  The transmitter loads  to 
190-200 ma plate current and 5 ma grid current in CW mode.  When  switched to 
phone the plate current drops to 40 ma.  There is no AM,  although for a brief 
period I was able to hear my voice, intelligible but  somewhat distorted, on a 
nearby monitor receiver.  When I tried again a few  hours later the AM was 
gone.  I measured a few voltages and the most  anomalous one was the plate of the 
clamp tube modulator which shows over 500  volts when it should read 115.  
Under the hood all looks O.K. with no  unusual smells or charred components.  
How can I restore AM to this old  rig?  Thanks, in advance, for any suggestions.
 
73, Alan - KB2HEI
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