Summary

Power output triode. 7.5 V directly heated cathode. Used as a Class A power output amplifier anda Class B push-pull output amplifier.
This valve was introduced with the type number UX210 in about 1924 for driving the then new moving coil loudspeakers. It was also found to be useful as a small transmitting valve and remained in use as such by amateurs for many years. The type number was abbreviated to 10 in 1932. The 'Cunningham Radiotron' branding indicates that this example was manufactured in the mid 1930s.
Manufacturer: RCA Radiotron Co. Inc., Harrison, NJ, USA.

Physical Description

Conical bulb with 4 pin UX style base.

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