04-09-2023, 10:19 PM
I can think of one set that does use a 32 tube and that is the National Radio SW-3 2VDC model. Although it's setup is pretty different from your set. As for the open coil. The rule of thumb is that feedback winding equals about 15-20% of the tank coil. If the tank coil on your set is for the bcb would be about 90t of small gauge magnet wire. The more turns the lower the frequency. Gauge is not all that critical but direction is as it should be wound the same as the feedback.
By experimenting with the grid leak values it can change the sensitivity, distortion, and selectivity. Generally the resistor will change the gain (1-5megs but have seen 10megs used). The cap is some where betwixed 250mmfd-25mmfd.
It heard that the 1B4 is a less microphonic tube than the 32 when I was working on the SW-3.
Have fun w/it and they don't like strong signals.
By experimenting with the grid leak values it can change the sensitivity, distortion, and selectivity. Generally the resistor will change the gain (1-5megs but have seen 10megs used). The cap is some where betwixed 250mmfd-25mmfd.
It heard that the 1B4 is a less microphonic tube than the 32 when I was working on the SW-3.
Have fun w/it and they don't like strong signals.
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 it!
Terry
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