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1 X CK5687WA TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: RAYTHEON. 1960s TUNG-SOL PRODUCTION.
17MM BRONZE PLATES, HALO GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
75/96% EMISSION (EM) 81/92% TRANSCONDUCTANCE (GM) 0.2/0.2mA/V GAS
CH166U1