Metal UCL11

Does anybody know a tube UCL11, Telefunken, with metal cover?

Pictures uploaded on UCL11 page.

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As I am still the owner of this metal UCL11, of course I “know” this tube. 

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This version of the UCL11 was produced in small numbers during world war II.

Unfortunately it is not for sale, I regret. 

Best Regards, Jacob 

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My question was if someone knows a bit more about history, development, and usage...

My UCL11 is not colored, is like a cupper or brondze metal cover.

• UCL11 (18 KB)

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The UCL11 glass version was introduced at July 1939 together with the metal types UCH11 and UBF11 and the rectifier UY11 glass tube.

Later on, a metal version of the UCL11 was developped and produced in small numbers. As this was in the progress of world war II, the scarcity of metal may have caused the early stop of production. However the production was not resumed after the war, as only the glass version appeared again.

Amazingly at least two metal versions were made: one with embossing stamp and one with paint stamp. Amazingly as well is your fully unpainted version, probably it is a development specimen ?

Jacob 

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