[Drake] R-4B calibrator problem

[Harvey Hetland]

Chris:

Capacitor C192, 1000 uF, is a common failure in the Drake R-4B 
receiver.  It is a filter capacitor on the output of the half-wave 
rectifier, D16, of the filament supply and provides the filtered 
operating voltage for the two 923 flip-flops and the 100 kHz oscillator.

73, Harvey, N6MM.

----------------------

Chris Codella, W2PA wrote:

> Have any of you run into this one?
>
> Suddenly today the 25kHz calibrator in my R-4B stopped working - but 
> not entirely.  When turned on, it seems to emit a raspy sounding 
> signal every 50kHz (instead of a carrier every 25).  Strange.
>
> Before digging in, I thought I'd ask here first.
>
> Tnx, 73,
> Chris, W2PA
>
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