Depending on how the circuit is arranged, if it is like the KB VP21 which used a PP11 you can get away with a single 9 volt battery like the PP9. But check any electrolytic capacitors in the speaker circuit are good.
Just found the circuit on the Radio Museum and it does not have the 2 capacitors across the batteries, to the speaker.
Mike
Just found the circuit on the Radio Museum and it does not have the 2 capacitors across the batteries, to the speaker.
Mike






