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48_Arcturus

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ID = 21255
       
Country:
United States of America (USA)
Brand: Arcturus Radio Tube Co.; Newark, NJ
Developer: Arcturus Radio Tube Co.; Newark, NJ 
Tube type:  Triode, vacuum 
Identical to 48_Arcturus = AC-48 = RA-1

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 / Half indirect / Parallel, (AC/DC)
Description Special indirectly heated tube from 1928 with one end of the 15 volt AC heater connected internally to the cathode. 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. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
 
usa_sonora_ra_1_front.jpg
48_Arcturus: My Friends Tube
Mark Skala

 
ac_26_28_32_40_48_ra1_so1~~10.png
48_Arcturus: Fin Stewart
Fin Stewart

 

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