Why bother with the battery? Just apply 22.5 volts of cathode bias using a Zener diode and never worry about it again. Darrell > On Feb 21, 2019, at 12:00 PM, Charles Vest <cvest at cox.net> wrote: > > Do you have a link to the battery you are using from e-bay ? > > Thank you , > Charlie , W5COV >>