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FOR SALE: 2 X 1635 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: RCA. 1950s PRODUCTION.
GREY PLATES, RECTANGULAR GETTER, MATCHED PAIR.
TESTED IN HICKOK 539C TUBE TESTER
MINIMUM GOOD = 540MHOS = 60%
900/900 EMISSION (EM) 900/900 EMISSION (EM)