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1 X 12SN7GTA TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: ULTRON. 1960s PRODUCTION.
GREY PLATES, RECTANGULAR GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
77/75% EMISSION (EM) 100/100% TRANSCONDUCTANCE (GM) 0.6/0.4mA GAS