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In Reply to: RE: Pope EL37 posted by Eli Duttman on February 05, 2017 at 17:46:52
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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