Hi petr!
You may ask Eddi, dj6ux.
He has a lot of literature about tubes.
You can contact him every afternoon on 7037 kcs.
73
Christian Groeger
Petr Maly <[email protected]> schrieb:
>Hello all
>I apology for the off-topic. However I know that this group is attended by
>very experienced gents, mainly from the UK.
>I found these two tubes in the junk, see the attachment. I spent quite a while
>to search the whole Internet for some specs, in vain.
>They are very similar to QB3/300, or TESLA’s RE125, same size, same socket.
>The only visible difference is the shape and material of the anode.
>I think the number 55 in the designation could possibly be the anode
>dissipation.
>The labels are:
>STC 4B/55
>ITT 4B/55/B
>By some lucky chance does anybody have any information about them?
>Thanks, 73, Petr, OK1FIG
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