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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