[Boatanchors] 1625 tube and Octal based metal tubes

[William L Howard]

> > Although the 1625 was designed well before the U.S.
> entry into  World War II it was a bit of an "education"
> (actually more like being  reminded of) the fact that
> there is still some history to be learned about  many
> of the things that we take for granted. <
>
> That is true. The 1625 is also an octal base, verses the 5 pin based
807. I
> was surprised to find octal based tubes in sets from 1937. Apparently,
the
> octal  design appeared a few years before I originally thought it did.
>
I think it was in the RCA Receiving tube manual but the metal octal
based tubes were first introduced in 1936.

Bill Howard