The "Knife-Edge" Crystal Set
A CORRESPONDENT, signing him--self "Light, Christchurch," sends in an adaptation of the "Knife Edge Rejector" which was described in the 1981 "Radio Guide." This very efficient and popular wavetrap has been converted into an equally efficient crystal set, the circuit of which is shown herewith. He states that it is very sensitive and selective. He is living in Christchureh, and both 8ZO and 3YA can be tuned out in favour of the other. It is being used transformer coupled to a Loftin-White: rf. choke’ between the transformer secondary and the grid of the screen-grid valve
and the set. With this and one or two other precautions it works splendidly, with plenty of volume, and is "clear as a bell."
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310522.2.47
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Radio Record, Volume IV, Issue 45, 22 May 1931, Page 15
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123The "Knife-Edge" Crystal Set Radio Record, Volume IV, Issue 45, 22 May 1931, Page 15
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