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I got some EL37 from a surplus seller. However they don’t match any of the EL37 pics I have seen on net. Some key issues:1. Mullard EL37 printed very stoutly. Can’t rub it off.
2. No date code etching anywhere.
3. No center hole on the guiding pin.
4. Mica wing spacer.At least they don’t look any special. I was expecting a formidable tube but this on is bit smaller than a 6L6G.
On the positive side, I know these came from the local radio station that used Leak equipment. The packaging is old time white box.
Follow Ups:
Good LORD you have a nice camera and skills to match! Definitely not Russian, and definitely VERY nice and rare/ likely valuable. Well; it certainly is a bit different from all other EL37s I've seen. Over the years, it's been more than a couple that have passed thru my hands... but, it does LOOK like an EL37 in many ways. It has the horizontal micas of EL37 (long rectangular mica strips down inside; not the atypical top micas)The problem I have with it are the micas spacers at the top that are visible parallel to the glass with the metal clips, never seen them in EL37. On the plus side: It is of very old production just judging from the hard-fired, rainbowed, super thick getters, shape and appearance of the glass envelope, etc etc. It's a a BIT smaller than other EL37s, but not by much. At first, I thought perhaps it was a KT series valve, but this isn't a KT; it's a pentode-- no beam former visible. I'd say you have a VERY EARLY EL37 on your hands. The complete absence of codes is VERY unusual, but not unheard of. Not sure, but I think Valvo may have made some early EL37s and did not always code. Are the getters two rings at the base, or upside down "cups", or upside down "bread loaf pan" shaped? Here's what it ISN'T: It's not a rebranded 6L6. There are no beam formers. It's not any communist bloc rebrand, & it's an incredible tube. A museum piece. Hang onto these; I gurantee they will blow away any 6L6 and compete easily with WE 350B. Beautiful tube; and not all early Mullards had the hole in the keylock; especially not EL37. I've seen many EL37 w/o hole in guidepin/keylock. You scored, here!
Are you familiar with this link? I don't speak German but perhaps with some translation there may be good tidbits. Anyhoo, the valves seem pretty close.Rob
http://www.jogis-roehrenbude.de/EL34-Story/EL34-Story-Dateien/el37_mullard/el37_mullard.htm
Thanks so much gentlmen.
So the verdict I assume is for a 'hold' and further 'buy' :)Cam is a SONY MiniDV handheld used with a steady hand in macro mode.
About 5" tall.
sell them to me if you don't want them
Base. No holes.
Close shot
WOW! What kind of camera is that?
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