[time-nuts] OXCO Issues -- Latest

Bob Camp lists at rtty.us
Sun May 12 11:57:59 EDT 2013


If they are carbon film, I'd look for cracked end terminations. Hopefully the color codes are still readable. That should make the replacement process fairly easy.

Another possibility - the thermistor bridge probably is / was regulated. If it's a zener diode, it may have opened up. That would boost the input voltage and increase the effective gain.  


On May 12, 2013, at 11:36 AM, Frederick Bray <fwbray at mminternet.com> wrote:

> Well, I decided to make the "Y" incision and pulled the circuit board out of the oven.  (Photos later after I crop them.)
> Yes, the trimpot is part of the circuit associated with the thermistor.
> My plan is to check the resistors (surprisingly most are carbon film except those in the thermistor circuit), look at the circuit board under a magnifier, and stick it back in the foam for testing after making any repairs.
> Thanks again for the continuing comments and advice.
> Fred
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