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1 X 12BY7A / 12BV7A / 12DQ7 TUBE. NEW OLD STOCK.
BRAND: SYLVANIA. 1960s PRODUCTION.
BLACK PLATES, HALO GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
176% EMISSION (EM) 134% TRANSCONDUCTANCE (GM) 37mA/V GAS
CH165U1