Radiola III
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TRF receiver
Made of green onyx catalin. The colour has changed to brown because of the influence of sunlight. The original colour can be seen in the picture on the right.
Catalin is a thermosetting polymer based on phenol and formaldehyde. It was rather popular in the 1930s and 40s, among others for making jewelry. In comparison with Bakelite, the colours are very beautiful, but the material is very fragile, some colours fade rapidly, and it shrinks.
With four metal tubes. Suitable for AC/DC. For medium wave reception, 170-555 meters (540-1760 Kc). Chassis type RC-350-A. 3 Inch dynamic loudspeaker. Undistorted output power about 1 Watt.
To keep the small device as cool as possible, a resistance wire is included in the power cord. About 20 Watts of heat is "eliminated" in this way.
The radio was made in a number of different colours: green (9X11), black (9X12), crème (9X13) and brown (9X14). Model 9X6 has a wooden cabinet.
Data Valves
Serial number: 016099
Dimensions (w×h×d): 19.1 × 13.2 × 11.9 cm
Voltages: 105-125 volt ~ and =
Made in: 1938
Purchased in: 2013
Weight: 1.93 kg
Click on a valve for more information


What was broadcast in 1938?


Listen to "I Got Rhythm" by the Bud Freeman Trio, Bud Freeman (ts), Jess Stacey (p), George Westling (d), recorded January 1938

Top view of the small chassis. I still have to find metal versions for the two middle valves.

Deze pagina is voor het laatst bijgewerkt op zondag 28 april 2019