SB-110A experiment

[Ron]

Mark Graalman WB8JKR wrote:
>
>   I have  something for you SB-110A owners to try when you
> have a few spare minutes to screw around.
>
>  I have a SB-110A here that works perfectly, and has no problems
> electrically. However sometime ago while doing some experimenting with
> the rig I discovered that if the cathode bypass capacitor (C67) on the
> audio
> output tube V6 is removed the BFO will stop. I found this rather
> astounding
> and never did really determine why. Just curious if this happens with
> other
> 110A's or if I just have a sleeping gremlin. Checked the board grounding,
> tried different ground paths etc, nothing changed anything.
>  I put the cap back in and everything works fine.........go figure.
>
> Mark  WB8JKR

I am not familiar with the circuit, but if the tube
is in the BFO loop, I'd expect this behavior. Removing
the cathode bypass cap substantially reduces the stage
gain.

-- Ron

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