45 tube types

Are there variations on the 45 tube, numbered in some other way, that I'm simply not seeing?

I'm pretty certain the answer is "no."

You might want to take out a subscription to Antique Radio Classified, which would allow you to place a free want ad each month. 45's were used in a number of high-end antique radios ca. 1932.

Also, some of these places might be worth contacting.

Regards,
-- Al

They are on Ebay fairly often... typically you can get a pair of National's or Philco's new for around $90 a pair. I can't recommend any seller in particular.

Of course you can always go to Emision Labs.

Following my earlier post, I received an informative communication from member Audiofeil, who indicated the possibility that variants of the 45 might have been produced under the designations 245 and/or 345, with identical specs and differing only in the shape of the glass (these being what is referred to as globe shaped). I then looked in the book "Tube Lore," written by Ludwell Sibley, who is a renowned expert on early tubes. It lists the 45 as AKA (also known as) the following types:

SE-3921
38045
UX-245
VT-45
FR-304
CV596

The book also indicates that 300-series counterparts of many 2-digit tube types were issued under the Cunningham label, so a CX-345 is also a possibility.

There was also a 45A, which the book indicates was similar to the 45 except uprated from 250 volts to 325 volts, and from 1.6 watts to 3 watts.

Hope that helps, and my thanks to Bill Feil.

Regards,
-- Al

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.