45 tube types

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?

A friend uses the EML meshplate 45s. He really likes that tube a lot (he has many NOS variants, including old globe 45s).

I use both meshplate and solid plate EML 2a3s. Both are very good, particularly the meshplate tubes.

My only caveat is that the website lists some very specific operating conditions. The recommendations should be strictly followed. EML tubes cannot be pushed excessively hard--that dramatically shortens life (it shortens the life of all tubes, but, the EMLs seem to be a bit more delicate in that respect).

If you have any questions about the use of EML tubes in your particular gear, contact George Lenz at Tubes USA (US seller of these tubes). He is VERY helpful, forthright and conscientious.