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ID = 28389
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 
  Ca. 1925 up to 1945 rare.
Identical to AC-28 = 28_Arcturus
Similar Tubes
Different connections:
First year Nov.1927 Saga of the Vacuum Tube, Tyne Seite 342

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 / Specified voltage AC/DC

Special half indirectly heated tube from 1928 with either one end of the 15 volt AC heater or its midpoint (Tyne) connected internally to the cathode. The result was an AC tube with a standard 4 pin base which could be used to "electrify" 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. The filament of this tube is carbon and 15 volts was chosen by the manufacturer because of the availability of 15 volt AC transformers for toy trains.

Dimensions (WHD)
incl. pins / tip
45 x 120 x 45 mm / 1.77 x 4.72 x 1.77 inch
Weight 53 g / 1.87 oz
Information source Saga of the Vacuum Tube, Tyne   p.342
-- Collector info (Sammler)   

ac_26_28_32_40_48_ra1_so1~~1.png AC-28: Fin Stewart
Fin Stewart

Just Qvigstad

Collection of



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