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ID = 40258
United States of America (USA)
Brand: Arcturus Radio Tube Co.; Newark, NJ
Developer: Arcturus Radio Tube Co.; Newark, NJ 
Tube type:  Triode, vacuum   Power/Output 
Identical to AC-40 = SO-1 = 40_Arcturus
First year Dec.1928 Advertisement

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 15 Volts / If 0.4 Ampere / Half indirect / Specified voltage AC/DC

Not to be confused with the common (Raytheon) tube 40 with a 5 volt heater. The Arcturus AC40 is one of the 7 first tubes developed by Arcturus for 15 volts series. The early production of the AC40 (and AC30) had a clear, tipped bulb, later productions had blue bulbs. The manufacturer chose 15 volts because of the availability of transformers operating at this voltage, for use in toy trains.

Dimensions (WHD)
incl. pins / tip
x 123 x 45 mm / x 4.84 x 1.77 inch
Weight 49 g / 1.73 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   

so1_sock~~2.png AC-40: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

Just Qvigstad

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