Sixty years ago, ARRL Technical Editor Doug DeMaw, W1CER (later W1FB) had a transistor radio that resisted all of his attempts to fix an intermittent problem somewhere in the RF or IF sections. Undaunted, he decided to convert the radio into a 2 meter receiver. He stripped out the offending parts of the circuit, and used that portion of the circuit board to install a superregenerative detector for 2 meters. He replaced the tuning capacitor with a smaller one and used the same mount. And the earphone jack was placed into service as the antenna jack.

The circuit here uses an NPN transistor. Depending on the existing circuit, it would be necessary to use a PNP transistor for a positive ground.  The circuit is shown in QST for June, 1966.