[codefox1]

Almost there, but really what I am suggesting is that you bypass the entire ac/battery switch.
Do this one connection at a time.

You can then remove the interlock, switch and battery plug from the set.

Then bypass the on/off switches on the volume control. Don't mix them up.

Once you have done this, you can use one of the on/off switches on the volume control to make or break the connection from one leg of the AC line to pins 3 and 5 of the 117Z3. Leave the other leg of the AC line where it is.

If you skip these steps the 117Z3 will remain lit as long as long as the set is plugged in.

Again see the 48-360 on Nostalgia Air, it's nearly the same set but the schematics are clearer.