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ID = 14665
United States of America (USA)
Brand: Sonora Tube Co.; Chicago, IL
Developer: Arcturus Radio Tube Co.; Newark, NJ 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to RA-1 = AC-48 = 48_Arcturus

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 15 Volts / If 0.35 Ampere / Indirect

The RA-1 is listed in the "German-Codex" wrongly as RA1. RA-1 was made by Arcturus for Sonora. 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 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. As Plate voltage 67.5-135, neg. grid voltage 4.5.

Dimensions (WHD)
incl. pins / tip
44 x 116 x 35 mm / 1.73 x 4.57 x 1.38 inch
Weight 58 g / 2.05 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
RA-1: aus ebay, Verkäufer lilwing3
Gottfried Silberhorn

RA-1: Fin Stewart
Fin Stewart

RA-1: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 5= 1928 ; 1= 1929?? ; 1= 1929?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):7

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