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2 X 6SN7GT / VT231 TUBE. NEW OLD STOCK.
BRAND: RCA. 1950s PRODUCTION.
BLACK PLATES, RECTANGULAR GETTER, COPPER RODS, PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
113/115% EMISSION (EM) 117/123% TRANSCONDUCTANCE (GM) 1.6/1.8mA/V GAS
95/84% EMISSION (EM) 100/92% TRANSCONDUCTANCE (GM) 0.2/0.2mA/V GAS
