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2 X 811A TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: UNITED ELECTRON. 1970s PRODUCTION
GREY PLATES, DUAL HALO GETTER ON THE SIDES, MATCHED PAIR.
TESTED IN FUNKE W20 TUBE TESTER
4.9mA EMISSION (EM)
4.5mA EMISSION (EM)
Uf 6.3v
Ua: +325v
Ug1: -0.0v