One of the features of 1931 will be considerable increase in the power or radio broadcast stations. This can be brought about only by an increase in the size of transmitting valves. The one shown in this illustration is the new 200-kilowatt valve to be installed in KDKA. The small valve, third, from the left, is an a.c. screen-grid, while the third from the right is the 250 power valve.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310102.2.4.1
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Radio Record, Volume IV, Issue 25, 2 January 1931, Page 1
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70One of the features of 1931 will be considerable increase in the power or radio broadcast stations. This can be brought about only by an increase in the size of transmitting valves. The one shown in this illustration is the new 200-kilowatt valve to be installed in KDKA. The small valve, third, from the left, is an a.c. screen-grid, while the third from the right is the 250 power valve. Radio Record, Volume IV, Issue 25, 2 January 1931, Page 1
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