Output triode, Originally numbered UX171A. The first small power tube marketed by RCA.
Manufacturer: RCA Radiotron Co., Harrison, NJ, USA.
5 V directly heated cathode.
Shouldered bulb with 4 pin UX style base.
Bulb: 71A/U.S.A. Base: (RCA logo)/Cunningham/Radiotron
Type of item
114 mm (Length)