Two Output triodes. Manufacturer: RCA Radiotron Co., Harrison, NJ, USA.
Triode 1: primarily intended for use in early AC mains operated equipment. Originally released as UX-171-A, abbreviated to 71A circa 1932. 5.0 volt directly heated cathode.
Triode 2: originally numbered UX171A. The first small power tube marketed by RCA. 5 V directly heated cathode.

Physical Description

Shouldered glass bulb with American style 4 pin (UX) Bakelite base.. Shouldered bulb with 4 pin UX style base. Both mounted on display block.

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