28-06-2020, 06:02 PM
Thanks for the battery information Mike. As I can get pj996 Eveready brand (4×F zinc carbon) and 1604 alkaline, for little money that's what I'll use. I am tempted to make a small modification of using a couple of small lithium cells to provide fixed op valve bias, to save the power lost in the series bias resistor.... However the set will only be run occasionally, its @ 80 years old and deserves a little rest!
Amie
Amie
