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1 X 5963 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: UNITED ELECTRON. 1970s SYLVANIA PRODUCTION.
17MM GREY PLATES, D-GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
116/90% EMISSION (EM) 109/91% TRANSCONDUCTANCE (GM) 0.6/0.8mA/V GAS