[Hammarlund] SP-600-JX-17 BFO WAVEFORM

[stbradford]

Good Morning List,

I am working on the old SP-600. In the cw position the cw has a raspy 
sound to it. The non BFO  functions work fine.

So I have spent my time with the bfo circuit. With the radio on, and the 
buffer between the bfo and the i.f. injection point , (6BA6), removed I 
have a oscillator wave form that looks more like an i.f. bandpass 
waveform. I feel it's this distorted wave form from the bfo oscillator 
that is causing the raspy sound when it is injected into the detector.  
The oscillator is strong and steady, the voltages and resistance checks 
are reasonable but the waveform sucks. Does this Hartley type 
oscillator  produce a clean ac waveform?, I always thought so. I suspect 
the silver micas inside the bfo can, but what a job to remove the can to 
check the caps.

Smith Bradford
W9HAK