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4 X 6AQ5W TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SYLVANIA. 1964 PRODUCTION.
BLACK PLATES, HALO GETTER, COPPER RODS, MATCHED QUAD.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
96% EMISSION (EM) 107% TRANSCONDUCTANCE (GM) 0.2mA/V GAS
99% EMISSION (EM) 104% TRANSCONDUCTANCE (GM) 0.4mA/V GAS
97% EMISSION (EM) 100% TRANSCONDUCTANCE (GM) 0.4mA/V GAS
93% EMISSION (EM) 103% TRANSCONDUCTANCE (GM) 0.5mA/V GAS
CH166U1
