Hey Russ,
The party, as I understand it, changed its view on low cost in order to get some extended flexability. Heating a 6.3V cathode with 5V is another option available too. The triple HV windigs offer L.C voltage from ~190 to 320 with a simple full wave. Other combinations on up to 800vac into a full bridge can be used as well.Besides, any ideas are welcome, and can be applied of they will merge well with the project.
regards,
Douglas