09-23-2022, 09:15 AM
Hi Skip,
Good to see last weekend (Ktown). I'll mention a couple of things that are a little different about this set than the average bear.
The p/s uses negative lead filtering. This means the positive sides of filter cap are connected together. The negative side connects the ct of the pt and then to the field coil. The other end of the field coil connects to ground as does negative of the 2nd filter cap. The field coil provides - voltage drop that creates the bias voltages for the 47.
The 47 tube has a rheostat in parallel it's filament. This is adjusted for minimum 60cy hum after the set is back together. No avc and vol control is a rf gain control, has nothing to if the audio circuits.
GL with your new project!
ps Rod is a faster typist than I.
Good to see last weekend (Ktown). I'll mention a couple of things that are a little different about this set than the average bear.
The p/s uses negative lead filtering. This means the positive sides of filter cap are connected together. The negative side connects the ct of the pt and then to the field coil. The other end of the field coil connects to ground as does negative of the 2nd filter cap. The field coil provides - voltage drop that creates the bias voltages for the 47.
The 47 tube has a rheostat in parallel it's filament. This is adjusted for minimum 60cy hum after the set is back together. No avc and vol control is a rf gain control, has nothing to if the audio circuits.
GL with your new project!
ps Rod is a faster typist than I.
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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