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1 X 6SN7GTB TUBE. USED.
BRAND: -. 1950s US PRODUCTION.
BLACK PLATES, RECTANGULAR GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
91/77% EMISSION (EM) 100/100% TRANSCONDUCTANCE (GM) 0.2/0.4mA/V GAS