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4 X EC92 / 6AB4 TUBE. NEW OLD STOCK.
BRAND: TUNGSRAM. 1970s PRODUCTION
GREY PLATES, SOLID GETTER
MATCHED QUAD
TESTED IN ROEHRENTEST TUBE TESTER
104% 10.36mA EMISSION (EM) 103% 10.32mA EMISSION (EM)
97% 9.74mA EMISSION (EM) 107% 10.74mA EMISSION (EM