KELLOGG Type 401 A.-C. Detector-Amplifier Triode
The McCullough type 401 was the first indirectly heated valve to be marketed in the USA. It was introduced in 1925. Made by Kellogg Switchboard and Supply Company, Chicago for McCullough Sales Co. Later (from 1929 on) manufactured by A.C. Neon Corporation of New York City.
The heater connections are via the two pins in the top of the bulb. They were designed so that they could be used to replace the directly heated valves in a radio, allowing AC operation. They were used by a small number of radio manufacturers as original equipment, for example Marti; Sparton used them for their 1927 AC models.
Max current = 7.2 ma
Mu = 10
Hauteur • Height • Höhe : 136 mm • 5" 3/8
Diamètre • Diameter • Durchmesser : 41 mm • 1" 5/8
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