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FOR SALE: 1 X 12BY7A TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SYLVANIA
BLACK PLATES, FLAT D-GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER
95/121% EMISSION (EM). 100/112% TRANSCONDUCTANCE (GM). 0.5/1.5mA/V GAS. 100/113% EMISSION (EM). 106/106% TRANSCONDUCTANCE (GM). 0.5/0.8mA/V GAS.