08-06-2011, 06:08 AM
What you can do is use a mono jack w/three contacts. break the connection at the grid resistor of the 27 tube. The grid goes to the tip contact, the detector output goes to the switch contact and the ring is grounded when mounted.
There is a significant impedance mismatch as you are going from a high impedance grid to 8 ohms. Will work much better if you use a transformer to match this difference. An audio output transformer(tube type) or filament will do fine.
Terry
There is a significant impedance mismatch as you are going from a high impedance grid to 8 ohms. Will work much better if you use a transformer to match this difference. An audio output transformer(tube type) or filament will do fine.
Terry
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
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
