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1 X 12AY7 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: GENERAL ELECTRIC. 1950s PRODUCTION.
BLACK PLATES, RECTANGULAR GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
70/76% EMISSION (EM) 82/82% TRANSCONDUCTANCE (GM) 0.2/0.1mA/V GAS