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1 X 12AY7 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: RAYTHEON. 1950s PRODUCTION.
17MM BLACK PLATES, HALO GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
93/96% EMISSION (EM) 100/100% TRANSCONDUCTANCE (GM) 0.0/0.1mA/V GAS