Valves for Automobile Receivers
AUTOMOBILE receivers in America are becoming extremely popular, and the result has been the development of a new series of valves designed specially for these. Typical of these are the 236, a screen grid radio frequency amplifying valves, the 237 and the 238, a general purpose and a power amplifying pentode respectively. These valvés have a filament voltage of 6.3 and draw about 3 amps. They are designed to operate from the car "A" battery. They are recommended to work upon 185 volts "B" and rely for their current on dry batteries. These can be fairly heavy owing to the availability of ample space. In addition there is a new 233 pentode valve for battery-operated receivers. This valve operates on 2 volts with a filament current of 0.26 amps. and 185 volts plate. This is one of the family of 280 valves which was introduced a short time back, The 230, it will be remembered, is a general purpose valve; the 231 a screen grid valve, the 282 a power valve, and now we have the 33, a two-volt pentode,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310814.2.43
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Radio Record, Volume V, Issue 5, 14 August 1931, Page 19
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184Valves for Automobile Receivers Radio Record, Volume V, Issue 5, 14 August 1931, Page 19
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