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in 1924, the Radiola 104 "loudspeaker" was one of the first AC
operated devises offered by RCA. Not only a powerful
electromagnetic speaker but an amplifier and power supply is
also contained in the cabinet.
used in the electronics are: 2 - UX-216B rectifiers, UX-874
voltage regulator, UV-876 ballast (or line regulator) and UX-210
(as referred to by RCA) also supplied A & B voltages needed to
operate the Radiola 28 receiver.
Manuals, labels & other paper for the above and other RCA Radiola models are available.