I expected to find
the tube at http://www.tubedata.org/
been collecting tube data sheets for 15 years but it wasn't
must be a very exotic tube!
Petr Maly skrev 2014-07-07
> 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
> while to search the whole Internet for some specs, in
> 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
> The labels are:
> STC 4B/55
> By some lucky chance does anybody have any
information about them?
> Thanks, 73,