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2 X VT231 / 6SN7GT TUBE. NEW OLD STOCK.
BRAND: SYLVANIA. 1940s PRODUCTION
DOUBLE T BLACK PLATES, RECTANGULAR/FLAT GETTER, RECTANGULAR MICA, MATCHED PAIR
TESTED IN AMPLITREX AT1000 TUBE TESTER
100/95% EMISSION (EM) 100/100% TRANSCONDUCTANCE (GM) 1.4/1.0mA GAS
102/97% EMISSION (EM) 107/107% TRANSCONDUCTANCE (GM) 2.8/2.8mA GAS