Mystery tube

[Diane Swynar]

Actually, I think Cunningham-made tubes were preceded by a "3"---ex. 345.
Likewise, Kellog tubes (I think) had a "4".

A 245 is simply an early globe/balloon envelope version of the
'45...nothing more, I'm afraid! Ditto the 280-cum-80, etc. etc.

I have seen both Westinghouse and RCA Radiotron examples of this.
Curiously, though, I have a Rogers "45" that is plainly marked as such, is
in a balloon envelope, and has a PERFORATED MESH PLATE!

Most unusual, and a delight to the eye...

~73~ Eddy VE3CUI - VE3XZ





> The "2" in front of the tube number indicates that the
> tube probably was actually made by Cunningham.  What
> you are looking for is a type 83A and a type 45.
> During the 1920s a type 45, 145, 245, and 345 were all
> the same tube, just made by different manufacturers.
> The same with the 83 series.
>
> The 45 was used in all sorts of radios during the late
> 1920s as an audio amplifier / output tube.
>
> Glen, K9STH
>
> --- "Peter J. Havens" <pjhavens at CYBERTRAILS.COM>
> wrote:
>
> but then these: a "283A" and a "UX245", both made by
> Westinghouse, both 4-prong, bakelite base, about 5
> inches tall. I can't find them in my 1973 RCA tube
> manual, any substitution manual, Antique Electronic
> Supply catalogs, nowhere.
>
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