45 tube types

Almarg,

This is what I was getting after with the numbering variations. I have an old radio that has a couple of these CX-345's in it and was wondering in the back of my head if I could utilize such a tube (and other such tubes) in a current configuration.

Thank all you guys for the responses so far.

Sounds to me like you are in luck!

Here is a datasheet on the CX-345, which as you'll see speaks of it as if it were a 45.

I compared the spec numbers with those of a 45 that appear in a reprint of an early tube manual I have. There are a few differences, but they are EXTREMELY minor (examples: mutual conductance 2100 vs. 2050; plate resistance 1670 vs. 1700; g-p capacitance 8pf vs. 7pf).

As an antique radio collector, I have never encountered any incompatibilities between 2-digit tubes and their 200 and 300 series counterparts.

Finally, the Sibley book states that the "only important exception" to the Cunningham numbers paralleling standard industry and RCA practice was the type 373.

Good luck!
-- Al

This place may have some.I don't know anything about this seller.[http://www.audiotubes.com/audtube.htm#aud%20list]

I cannot believe nobody has posted this yet, but the best 45s are actually NEW PRODUCTION anyway - TJ (Full Music) and EML.

They are not cheap but last a long time.

Has anyone experienced the EML Limited edition 45-Globe?