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CRYOGENICALLY TREATED!Russian Military 6n14n-EB(EV) which is a ruggedized ULTRA PREMIUM CRYO TREATED GRADE!7189 equivalent able to operate at 400V + plate voltage like a traditional 7189. Also fully equivalent to a 6BQ5/EL84. These are as tough as a Russian tank! THESE ARE AS GOOD OR BETTER THAN ANYTHING AVAILABLE TODAY DUE TO THEIR RUGGED CONTRUCTION, HI PLATE VOLTAGE RATING, AND EXCELLENT TONE. I hand test and match these myself at high voltage. | |