Anyone who can help me about historical data and information about this radiotube.
I just bought an RADIOLA III-A ( 1924 ) and one of
the tubes was this one.

Christer: The original tubes for this radio were type WD-11. I don't recognize the tube nomenclature that you referenced.

Does the tube fit into the original tube sockets of the Radiola III-A? If so, then it must be a WD-11 (the tube base of the WD-11 is unique). They are scarce as hens' teeth.

WD-11s are, in my opinion, too valuable to use in the radio. There are cheaper substitutes (that require an adapter).

Here my info on the WD-11/III-A business: http://www.enginova.com/Radiola_III.htm

If you can take a photo of the tube and its markings, you can send it to George Fathauer who might be able to tell you something about its history, etc.: http://www.users.qwest.net/~tubes/

:Anyone who can help me about historical data and information about this radiotube.
:I just bought an RADIOLA III-A ( 1924 ) and one of
:the tubes was this one.

Hi

The tube would be WD11 that Doug mentioned. It's the only popular tube with one large and 3 small pins used in Radiola III.

I have built WD11's from 3Q5GT, 3D6 and 5676 tubes. Jamed Fred used to make replacement bases but not any more. Bill Turner still sells WD11 replacements. He had a couple strokes so it may take some time? His latest are using the 5676 inside a silvered test tube glass. If you want to make your own I can send the information. Bill thought they looked nice and went into production.

http://www.dialcover.com/tubes.html

Norm

:Christer: The original tubes for this radio were type WD-11. I don't recognize the tube nomenclature that you referenced.
:
:Does the tube fit into the original tube sockets of the Radiola III-A? If so, then it must be a WD-11 (the tube base of the WD-11 is unique). They are scarce as hens' teeth.
:
:WD-11s are, in my opinion, too valuable to use in the radio. There are cheaper substitutes (that require an adapter).
:
:Here my info on the WD-11/III-A business: http://www.enginova.com/Radiola_III.htm
:
:If you can take a photo of the tube and its markings, you can send it to George Fathauer who might be able to tell you something about its history, etc.: http://www.users.qwest.net/~tubes/
:
::Anyone who can help me about historical data and information about this radiotube.
::I just bought an RADIOLA III-A ( 1924 ) and one of
::the tubes was this one.

Thanks for all the tip!
One interesting thing is that my radio had the following tubes: two R.C.A WD 11. one TELEFUNKEN R.E 152. one RADIOTRON R.C III.
All with the same base ! ( Long pin )