From FB group Vintage Transistor Radios
There are really only two types of germanium transistors in older radios. One is for the RF and IF stages and has low collector to base capacitance. The other is audio and can handle a few hundred milliwatts. I recently replaced the germanium audio transistors with silicon, with change to the base bias resistor.
The old radios I’ve troubleshot have seldom had problems with the transistors. Mostly problems with electrolytic capacitors drying out, and carbon composition resistors changing to a much higher value. Before you remove a transistor (and risk damaging it), check the capacitors and resistors.
