30-04-2026, 10:45 AM
Six AA in two holders (3+3 or 4+2) fit in a PP9. Some newer PP9s are plastic cases. Alkaline give a similar run time.
I've done this with loads of sets (Hacker, Fidelity, Ever Ready, Roberts etc). I also made some custom cases out of card with vintage Ever Ready colour prints glued. It's not just cosmetic because anything other than a PP9 will not stay in place.
O/P germanium transistors are the worst as the rest of AF & RF can be replaced by military Russian parts from Ukraine, or even Silicon PNP. Some circuits have sufficient emitter resistors that no resistor change is needed for the higher Vbe.
I've done this with loads of sets (Hacker, Fidelity, Ever Ready, Roberts etc). I also made some custom cases out of card with vintage Ever Ready colour prints glued. It's not just cosmetic because anything other than a PP9 will not stay in place.
O/P germanium transistors are the worst as the rest of AF & RF can be replaced by military Russian parts from Ukraine, or even Silicon PNP. Some circuits have sufficient emitter resistors that no resistor change is needed for the higher Vbe.
