Double-Grid Valves
GINCE the description of the amplifier to work from 22% volts was published last week, local dealers have had numerous enquiries for the 241 valve. Unfortunately this valve is not procurable at present, but by adding another cell in the "A" battery the 441 may be used
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https://paperspast.natlib.govt.nz/periodicals/RADREC19281221.2.55
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Radio Record, Volume II, Issue 23, 21 December 1928, Page 23
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49Double-Grid Valves Radio Record, Volume II, Issue 23, 21 December 1928, Page 23
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