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2 X 12BY7A / VT289 TUBE. NEW OLD STOCK.
BRAND: SYLVANIA
BLACK PLATES, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER
104/100% EMISSION (EM). 106/106% TRANSCONDUCTANCE (GM). 0.4/0.5mA/V GAS.
108/117% EMISSION (EM). 118/125% TRANSCONDUCTANCE (GM). 1.1/1.6mA/V GAS.