A New Valve
"THE appearance of a new low filament consumption valve-Radio-tron 221, is creating interest among battery using set owners. It has for long been the policy of the R.C.A. to keep .25 amp-vulves and experimenters will be interested to know how the new valve is turning out. One has been sent along to our laboratory for test and the figures relating to it will appear probably in our next issue.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300424.2.35
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Radio Record, Volume III, Issue 41, 24 April 1930, Page 8
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72A New Valve Radio Record, Volume III, Issue 41, 24 April 1930, Page 8
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