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5 X 12AU6 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: TELEFUNKEN. 1970s PRODUCTION.
GREY PLATES, HALO GETTER, COPPER RODS, MATCHED QUINTET.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
81% EMISSION (EM) 103% TRANSCONDUCTANCE (GM) 0.2mA/V GAS
79% EMISSION (EM) 100% TRANSCONDUCTANCE (GM) 0.3mA/V GAS
81% EMISSION (EM) 103% TRANSCONDUCTANCE (GM) 0.4mA/V GAS
73% EMISSION (EM) 96% TRANSCONDUCTANCE (GM) 0.4mA/V GAS
81% EMISSION (EM) 103% TRANSCONDUCTANCE (GM) 0.4mA/V GAS