[Milsurplus] Audio Output Tranny- Mystery Failure Mode

[Richard Brunner]

Yes, dollars to donuts it's  a shorted turn in the output transformer.  Once 
I had a Navy receiver with plenty of audio at the output stage grid, little 
at the plate, and no output.  I replaced the transformer (with a heater 
transformer)  and it worked fine.

Richard, AA1P

> At 06:03 02-08-13, David Stinson wrote:
>>Working on the Navy REP Moral(e) receiver.
>>It has a single-ended class A 6V6 output.
>>Audio level is about half what it should be and distorted.
>>Substitution shows the problem to be both the output transformer and
>>the internal speaker.
>>
>>I pulled the output tranny.  DC resistance checks show what
>>one would expect for good windings.  Used a DC supply at
>>90 volts between points and had no detectable leakage between input
>>and output windings or to ground.
>>
>>Ideas as to what the failure mode in this tranny might be?
>>
>>73 DE Dave AB5S