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2 X 6197 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: RCA. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, 3 MICA, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
103% EMISSION (EM) 98% TRANSCONDUCTANCE (GM) 2.2mA/V GAS
104% EMISSION (EM) 101% TRANSCONDUCTANCE (GM) 3.6mA/V GAS