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4 X 6AK5W TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: RAYTHEON. 1950s ARMY PRODUCTION.
BLACK PLATES, RECTANGULAR GETTER, PLATINUM MATCHED QUAD.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
132% EMISSION (EM) 115% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
132% EMISSION (EM) 93% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
132% EMISSION (EM) 121% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
132% EMISSION (EM) 115% TRANSCONDUCTANCE (GM) 0.0mA/V GAS
CH166U1