Pentode's Dynamie
‘An Improvement
F HUNTLY (Dannevirke) writes: * Like myself, I suppose many constructors avoid the idea of using castiron for pot magnet on account of the low permeability. As I am-construct-ing one of wrought iron, I asked the’ blacksmith to make me a cylinder of wrought iron bar 4in. x 8-8in. by 124in. long. If intended to be welded allow a little more in length. The end plates can be of the same material. The core is 1din. iron bar. To cut down cost as much as possible I had all joints ground flat on a shearing machine grinder. This pot cost me 7s.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290809.2.34
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Radio Record, Volume III, Issue 4, 9 August 1929, Page 13
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105Pentode's Dynamie Radio Record, Volume III, Issue 4, 9 August 1929, Page 13
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