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2 X 6197 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: UNITED ELECTRON. 1970s PRODUCTION.
BLACK PLATES, HALO GETTER, 3 MICA, PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
114% EMISSION (EM) 101% TRANSCONDUCTANCE (GM) 29.3mA/V GAS
71% EMISSION (EM) 83% TRANSCONDUCTANCE (GM) 3.8mA/V GAS
