[Boatanchors] Audio Output Tranny- Mystery Failure Mode

[jmfranke at cox.net]

Partially shorted primary winding.

John  WA4WDL

---- David Stinson <arc5 at ix.netcom.com> 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
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