5 X 12AU6 TUBE. NEW OLD STOCK IN ORIGINAL BOX.

BRAND: TELEFUNKEN. 1970s PRODUCTION.

GRAY 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