McMICHAEL MAINS THREE RADIO, 1931
The McMichael Mains Three of 1931 was a three valve TRF receiver that was built like a Tank, with a metal back and no expense spared on its construction. In 1931 it cost 20Gns. Valves and Royalty's included.
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The Mains Three is what is known as a 'landmark set', i.e. it introduced a significant or interesting feature into radio design. In this case, it was the first radio to have a dial calibrated directly in wavelength (metres) - up until then dials/knobs were 0-100 with a look-up table.
Bruce Hammond Collection
Thanks to (www.McMichael.org.uk) David Cochrane.