09-12-2016, 08:37 PM
Hi Mike,
The 36 mixer tube has a lot going on and I'm not surprised that if you fool with the plate or grid leads it conks out. Just leave them be. The trimmer that you show in your pic is not #7 but the sensitivity or regeneration control for the 2nd det. If you have a bit of a wooden dowel (1/4") drill and tap a hole in the end of it to fit the screw on the trimmer. Use this to set the sensitivity. Using a metal nut and driver will detune the circuit. This adjustment doesn't have any effect on the IF frequency so it won't screw up the IF alignment. For best performance you'll need to adjust the IF trimmers using a signal generator. Don't even think about trying to do it "by ear" as some may try. Just makes it worst.
The 36 mixer tube has a lot going on and I'm not surprised that if you fool with the plate or grid leads it conks out. Just leave them be. The trimmer that you show in your pic is not #7 but the sensitivity or regeneration control for the 2nd det. If you have a bit of a wooden dowel (1/4") drill and tap a hole in the end of it to fit the screw on the trimmer. Use this to set the sensitivity. Using a metal nut and driver will detune the circuit. This adjustment doesn't have any effect on the IF frequency so it won't screw up the IF alignment. For best performance you'll need to adjust the IF trimmers using a signal generator. Don't even think about trying to do it "by ear" as some may try. Just makes it worst.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
