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1 X 6197 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: UNITED ELECTRON. 1970s GENERAL ELECTRIC PRODUCTION.
BLACK PLATES, HALO GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
86% EMISSION (EM) 87% TRANSCONDUCTANCE (GM) 5.8mA/V GAS