Well, we may have multiple problems here. But I did get the audio
back...for now. I decided to check and see if there was any sidetone.
With a dummy load hooked up I tapped the leads from the power set switch
together - had power our but no sidetone. Don't know what possessed me,
but I decided to take a listen through the headphones. Voila, sidetone,
and after tickling around a little bit I had some receive audio.
So I messed with the selectivity switch again and bingo, full audio!
Pull the headphone plug out - silence.
So, I guess I'll definitely clean that switch, then go after the
headphone-jack/speaker circuit to see what gives. I'd like to think
that it was something as simple as a bad connection at the jack, or even
if the loud signal from the calibrator just blew out the speaker.
Things are never that simple, though.
Then I can try out some of the suggestions on my set-screws.
73,
Tom
Mike Bryce wrote:
> Tom...
>
> for the tuning knob, try this.
>
> Get a hunk of line cord from the junk box. take the coating off and pull
> out one single strand of copper wire.
>
> insert the copper wire into the screw hole, then the set screw. The
> copper will give the threads on the set screw something to latch onto.
> If the hole is really bugger up, you may need two strands.
>
> as for the audio bug,
>
> Scope the center wiper on the volume control. I bet the selectivity
> switch may just need a good cleaning. A scope will tell if you have
> audio at the selectivity control by looking at that center wiper on the
> volume control.
>
> if you don't then work your way back towards T2 on the #80356 board.
> It's possible with extra large signals, you have some bugs in the d2-d5
> diodes used in the receiver product detector
>
> BTW... miserable board to get out of the radio!
>
>
> Mike, WB8VGE
> SunLight Energy Systems
> The Heathkit Shop
> http://www.theheathkitshop.com/
>
> O
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