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2 X EF804S TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: SIEMENS. 1960s TELEFUNKEN PRODUCTION.
GREY PLATES, HALO GETTER, HIGH GAIN, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
160% EMISSION (EM) 125% TRANSCONDUCTANCE (GM) 1.2mA/V GAS
153% EMISSION (EM) 120% TRANSCONDUCTANCE (GM) 0.2mA/V GAS