[Mondial]

Gary, I looked at the schematic and the copper oxide rectifier was only used for the line voltage test function. The AC line voltage is reduced by the resistive divider of the 75K and 1200 ohm resistors to only a couple of volts, so the turn on voltage of the diode will be significant. You probably will be better off using the germanium diode as mentioned in my previous post. Reverse voltage rating will not be a problem as the diode will see only a few volts in the reverse direction.