01-03-2018, 12:15 AM
Hi Bill and welcome,
As Bob eluded to your tester is too new and doesn't test the standard base tubes. To answer your question yes they have been superseded but they have different style bases. The "new" self centering octal base tubes came out in 1935. You'll find that the old standard tubes sometimes are used up abt WWII.
GL
As Bob eluded to your tester is too new and doesn't test the standard base tubes. To answer your question yes they have been superseded but they have different style bases. The "new" self centering octal base tubes came out in 1935. You'll find that the old standard tubes sometimes are used up abt WWII.
GL
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 "[-]")
