10-05-2017, 04:18 PM
Geez I thought I had a lot of time on my hands.
Think it would be simpler to build a p/s to emulate the batteries. Well at least for the hv and filament supply the bias batteries would last a very long time.
Or you may want to consider building a battery pack that would power it. In this you can eliminate all of the interference from the ac mains. I have 39-80 (battery farm set) it plays quite well from batteries. Like supersized transistor radio.
The 1938 model use the older 2v tubes so a resistor in series is in order to drop 3v worth of battery power down to two. The '39 models use 1.5v tubes so D cell work fine.
Think it would be simpler to build a p/s to emulate the batteries. Well at least for the hv and filament supply the bias batteries would last a very long time.
Or you may want to consider building a battery pack that would power it. In this you can eliminate all of the interference from the ac mains. I have 39-80 (battery farm set) it plays quite well from batteries. Like supersized transistor radio.
The 1938 model use the older 2v tubes so a resistor in series is in order to drop 3v worth of battery power down to two. The '39 models use 1.5v tubes so D cell work fine.
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
