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ID = 40233
United States of America (USA)
Brand: Arcturus Radio Tube Co.; Newark, NJ
Developer: Arcturus Radio Tube Co.; Newark, NJ 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to AC-48 = RA-1 = 48_Arcturus

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 15 Volts / If 0.35 Ampere / Indirect / Specified current AC/DC ~ = (Series working)

Special indirectly heated tube from 1928 with one end of the 15 volt AC heater connected internally to the cathode. This voltage was chosen by the manufacturer to make use of the availabllity of 15 volt AC transformers used in toy trains. The result was an AC tube with a standard 4 pin base which could be used to "electify" battery receivers. There were 7 tubes in the 15 volt series with numbers running from AC22 to AC48. Arcturus did not use the "AC" prefix on the tube numbers in their ads, but the earliest production tubes were so marked on their bases. See also Sonora RA-1 = AC48 or 48. These tubes all had carbon filaments.

Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 47 g / 1.66 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Saga of the Vacuum Tube, Tyne   p.342

ac_26_28_32_40_48_ra1_so1~~3.png AC-48: Fin Stewart
Fin Stewart

Just Qvigstad

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