Hi It depends on just how closely you define the term. Simple answer WWII military gear for the principle (all glass etc). For the exact dimensions and pin sizes. Post WWII TV sets.
Bob > On Feb 19, 2016, at 2:44 PM, Hal Murray <[email protected]> wrote: > > > [email protected] said: >> An interesting find, but not as old as advertised: Friesecke & Hoepfner only >> moved to Erlangen-Bruck after WW2, in or around 1949. ... > > When were 7 and 9 pin tubes first used? > > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
