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4 X 6AQ5 / EL90 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: FIVRE. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, COPPER RODS, QUAD.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
114% EMISSION (EM) 110% TRANSCONDUCTANCE (GM) 4.8mA/V GAS
88% EMISSION (EM) 102% TRANSCONDUCTANCE (GM) 4.6mA/V GAS
105% EMISSION (EM) 111% TRANSCONDUCTANCE (GM) 5.4mA/V GAS
99% EMISSION (EM) 104% TRANSCONDUCTANCE (GM) 2.6mA/V GAS
CH164U1
