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I recently came into three Pope EL37. The bottle is stamped Made In Holland but the production code is for Blackburn Mullard plant. The getters on these tubes look like wafers or a capsized boat or something. I have examples of Mullard EL37 and all I have seen have hoop getters. The Pope tubes are smoked at the top. The production code on all three is R61B6K.
I'm guessing that these are later production because of the box printing and bottle logo but that may not mean anything. I'm interested to know more about these tubes and the EL37 in general. I have two amplifiers that use them and I really love their sound.
Dutch giant Philips owned the rights to any number of brands. Pope is but 1 of them. People talk about Dutch Amperex, but there really is no such thing. True Amperex was made at Hicksville, NY.
Boxes and labels may have little meaning. What matters is the plant the tubes were produced in and the date of manufacture. Obviously, there is nothing wrong with tubes made at Blackburn. Somebody more knowledgeable than me will decode the date info.
R61: R6 = EL37. 1 = type 1.
B6K: B = Blackburn. 6K = Nov 1956 or 66.
AFAIK, Blackburn made some of the finest tubes. Esp their rectifiers. The Blackburn made GZ34 tubes are legendary.
As long as those EL37 rectifiers are strong, do not have loose internals, and quiet... you have a very nice tube. Use it in appropriate circuit and it'll last just about forever.
FL, the EL37 is a power O/P type. I think you are confusing it with the GZ37, which IS a full wave rectifier.
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