Re: 3 valve sw trf receiver
Practical Wireless published a 3 valve (plus rectifier for the psu) trf design in Apr 1959 and then published a further article in Dec 61 to add an rf stage.
The original used the following line up
6J7, 6C5 or 6J5, 6V6
The articles are available on the wonderful american radio history website.
Peter
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