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2 X 12BY7 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SYLVANIA. 1960s PRODUCTION.
BLACK PLATES, HALO GETTER, COPPER RODS, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
116% EMISSION (EM) 115% TRANSCONDUCTANCE (GM) 1.2mA/V GAS
113% EMISSION (EM) 112% TRANSCONDUCTANCE (GM) 1.0mA/V GAS
CB406U1