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2 X 12AT7 / ECC81 HALTRON TUBE. NEW OLD STOCK. SIEMENS UND HALSKE PRODUCTION, MATCHED PAIR
TESTED IN ROEHRENTEST TUBE TESTER:
78/80% EMISSION (EM)87/90 % TRANSCONDUCTANCE (GM) 0.6/0.6mA/V GAS
84/82% EMISSION (EM) 87/98% TRANSCONDUCTANCE (GM) 0.6/0.8mA/V GAS