While rummaging around for some old stuff, I found, packed away among a bunch of NOS GE 6550s, two NOS EL34s which were branded "EDICRON."
The boxes are dark blue/grey, labeled "Edicron london Electronic Tube" and "Edicron london Electronic Valve" on alternating panels. The tubes have narrow glass envelopes with flat tops (that is, not rounded on top like my JJs) and the printing on them says, "EDICRON EL34 N8WN8." The silvering on the inside of the envelopes extends down about 1/2" from the flat tops.
I put them into my Dynaco Mk II just long enough to see how they bias up and to verify that they work and aren't shorted. Without changing the bias setting where I run my JJs (45ma per tube) they ran at 65ma per tube.
Does anyone have any knowledge or experience with "EDICRON" EL34s, and whose factory these may have come from? "EDICRON" is apparently a marketing company that sources its product from all over. Various sources on the Web suggest the source may be the former Yugoslavia (both EI and JJ are mentioned) or Russian. There is no country of origin marked on the boxes or tubes. "EDICRON London" isn't going to fool me. I'm certain that these are not Mullards!