Fifty years ago this month, the November 1974 issue of Radio Constructor showed how to put together this simple one-transistor regenerative receiver.  The transistor was “reflexed” to allow a bit more gain, but it still required a crystal earphone.  For a bit more volume, an optional AF amplifier using an additional transistor was recommended, but the set could be built either way.

Using plug-in coils, it covered 1.5 to 36 MHz, and was said to be simple to operate.