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In Reply to: help id these brown base EL34 ? posted by audioGuest on April 4, 2014 at 18:14:34:
They were marketed under the JJ name with black and brown bases and those particular ones you have could have been made when it was still named Tesla and later became JJ..Either way,those are an E34L and the staples and the overlap halos are the giveaway..They made them for Groove Tubes as well however,Aspen Pitman upgraded the tube a bit making it an E34LS with wings on both sides of the plate to give it more dissipation of 30 watts vs 25 watts.Another telltale factor that these are Tesla is the pin holes in the micas which are directly across from each other and,you will also notice that the micas don't have the teeth cuts all the way around the insulator but merely in the front and back of the protruding parts of the plate..I also have some Marshall branded EL34s thst look like your tubes internally and those are also Tesla.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 04/05/14 04/05/14
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Follow Ups
- Those tubes are E34L and they are made by JJ from the original Tesla design. - Michael Samra 02:19:32 04/05/14 (1)
- thank you ! nt - audioGuest 09:39:05 04/05/14 (0)