2 X 5963 TUBE. NEW OLD STOCK IN ORIGINAL BOX.

BRAND: KENTRON. 1950s PRODUCTION.

17MM BLACK PLATES, U-FOIL GETTER, MATCHED PAIR.

TESTED IN AMPLITREX AT1000 TUBE TESTER:

97/102% EMISSION (EM) 100/109% TRANSCONDUCTANCE (GM) 0.4/0.8mA/V GAS

95/99% EMISSION (EM) 100/100% TRANSCONDUCTANCE (GM) 0.2/0.2mA/V GAS