Thank you.......I appreciate the info. It is interesting that semiconductors
would degrade in that manner, unless they were being run near their design
limits. If this is the case, the parameters were not derated properly.
I ran into the same thing with the Lowe receivers. They are using a 4569 to
divide the uP clock down to the BFO injection frequencies. Every so often,
these chips fail when brought up to operating temperature. Aside from the
dense plated through holes, these radios aren't nearly as bad to service as
that 6800 is. Anyway, it did turn out that the trimmer was indeed cracked. I
have repaired the unit and it is going back to the owner. It was the most
incredible nightmare to repair, but I was able to fix it.
The fellow that I made the deal with is giving me a Grundig 3400 as a
consolation prize. That radio is a little bit bigger than what I would
normally use, but it is good trading material.

Pete

"C.R. Kuijer" wrote in message
...
Are you sure?
Pse check the amplitude on both inputs of the PLL circuit.
In both cases when locked and when lock is lost.
About 50% of the 2SC930 in this radio will have 50% reduced hFE.