10-24-2011, 12:13 PM
Agree, this is one of more bizzare power supply I have ever seen. Lots of options here, none too difficult.
I think you could possibly obtain a beefy control transformer (120/240 volt primary and 24 volt secondary at least 1 amp since we will derate as follows)
Seperate the 120 volt windings if they are tied together at the terminal to provide isolation. Use one of the primaries as the input, use the 24 volt secondary to feed the filaments, and the remaining 120 volt through a solid state voltage doubler. I've done this a few times with farm radios and it works out well.
You could also rewire the filaments in parallel and use a heat sinked! LM317 to provide the 6.3 filaments.
I think you could possibly obtain a beefy control transformer (120/240 volt primary and 24 volt secondary at least 1 amp since we will derate as follows)
Seperate the 120 volt windings if they are tied together at the terminal to provide isolation. Use one of the primaries as the input, use the 24 volt secondary to feed the filaments, and the remaining 120 volt through a solid state voltage doubler. I've done this a few times with farm radios and it works out well.
You could also rewire the filaments in parallel and use a heat sinked! LM317 to provide the 6.3 filaments.
