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2 X 5U4GB HITACHI TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: HITACHI. 1950s PRODUCTION.
BLACK PLATES, HALO SIDE GETTER, MATCHED PAIR.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 80mA
154/160mA EMISSION (EM)
165/155 mA EMISSION (EM)