09-01-2020, 05:48 PM
The deal on the 50B5 is that plate and heater pins are next to each other which there could be a possibility of arcing. It was superseded by the 50C5. 50C5 same tube specs but different pinout to limit the arcing possibility. 50A5 and 50L6 along with the a fore mention tubes have same specs but bases and or pinout are different so none of them are directly interchangeable.
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
