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4 X CK5687WA TUBE. USED.
BRAND: RAYTHEON. 1960s PRODUCTION.
BLACK PLATES, D-GETTER, COPPER RODS, MATCHED QUAD.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
78/75% EMISSION (EM) 77/81% TRANSCONDUCTANCE (GM) 0.6/0.4mA/V GAS
70/76% EMISSION (EM) 81/81% TRANSCONDUCTANCE (GM) 0.4/0.2mA/V GAS
86/70% EMISSION (EM) 77/74% TRANSCONDUCTANCE (GM) 0.6/0.4mA/V GAS
74/70% EMISSION (EM) 88/80% TRANSCONDUCTANCE (GM) 0.7/0.6mA/V GAS
CB406U1
