The Ace V is a one tube, battery powered regenerative receiver. This is the later version of the Ace V. "Ace" was a brand name of the Precision Equipment Company, which Crosley purchased in early 1923, in order to obtain their Armstrong patent.

The tube in this picture is an early version of a UV-200 Detector with a brass base and a tip on the globe. It has a one amp filament that burns fairly bright when in use; the operator usually determined how much to turn the rheostat up by how bright it was lit. This is the reason the early type sets such as the Ace had a peep hole in the front panel. At the time of it's manufacture, RCA sold two types, the UV-200 Detector tube, and the UV-201 Amplifier tube. The UV-200 is argon gas filled and the UV-201 has a high vacuum. The 200 Detector tube is more sensitive and gives a stronger output which is better suited for a one tube regenerative set. It has more noise, however, and was not used in most later multiple tube sets.

One later tube type that also works well in this set is the 201A. Later versions of the 201A had a bakelite base and no tip on the globe. The UV-201A tube was announced by RCA in December of 1922, but was not available until about April 1923. It has a thoriated filament and draws 1/4 amp. The "A" suffix on all these early tubes indicated that they used less current, and they are referred to as "dull emitter" types. These tubes had such a dim glow that the peep hole became useless.