[Mondial]

Can you explain, please? Since I am going to have to put together a parts order (TR701 and 702, as well as the electrolytics in the circuit as well as parts for another upcoming receiver), I might as well go ahead and buy these protection diodes at the same time.

All you need is some 1N4007 rectifier diodes placed in reverse parallel and connected across the input wire from the knob to ground. Something like this from another posting here where the diodes were recommended to protect a VTVM meter movement.


[Image: http://philcoradio.com/phorum/attachment.php?aid=11799]


Wait on installing the diodes until you get the circuit working properly first, as they may reduce the sensitivity somewhat and it would be good to compare with the diodes in and out of the circuit.