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2 X ECC83 / 12AX7 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: ULTRON
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
83/100% EMISSION (EM) 87/100% TRANSCONDUCTANCE (GM) 0.0/0.0mA GAS
83/100% EMISSION (EM) 93/93% TRANSCONDUCTANCE (GM) 0.0/0.0mA GAS