A while back, I too, had the same problem with the BFO not working. I checked each and every part in the circuit and couldn¡¯t find a thing wrong with it.?
My fix?
I added a small value electrolytic capacitor to the VCC line, if I remember 22 or 47 mFd.
And that fixed the problem.?
I have no idea what the added capacitor started the oscillator, but it has worked ever since.
mike, wb8vge
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On Dec 30, 2024, at 10:18 AM, Dave W7GZ via <
w7gz@...> wrote:
Many tnx reply, Steve. Mine is an 11-tube with S/N 6717B. How does it compare in age to yours? It works fine with the pull-down resistor now, before I had to wait many minutes, sometimes forever for the BFO to start.
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This one is an interesting specimen. It was sold to me for dirt cheap as a parts radio because it had been left in humidity and has quite a bit of rust on the top surface, but underneath it is pristine. After replacing 5 tubes that had vented through their pins, I discovered it was actually a working set. Not as nice looking as my R-4C, but it is completely usable and sensitive.
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Thanks for posting your issue, it helped me realize it has been seen before. Dave
