04-03-2018, 07:15 PM
Hi Trevor,
I've plenty VCR mains transformers here if you need any.
Best one in use is an ex-Fisher VCR transformer which has a 55volt winding, add this to another winding and supply this to the HT voltage doubler and over 180 volts is available. That's sufficient headroom voltage for the series regulator transistor to provide 160 volts for the Philco model 295 "farmhouse" radio. A 60 volt supply is provided for the screen grids of the 1A4E RF and IF tetrodes. A separate transformer and regulator supply the -3 and -9 volts grid bias.
Geordie McBoyne.
I've plenty VCR mains transformers here if you need any.
Best one in use is an ex-Fisher VCR transformer which has a 55volt winding, add this to another winding and supply this to the HT voltage doubler and over 180 volts is available. That's sufficient headroom voltage for the series regulator transistor to provide 160 volts for the Philco model 295 "farmhouse" radio. A 60 volt supply is provided for the screen grids of the 1A4E RF and IF tetrodes. A separate transformer and regulator supply the -3 and -9 volts grid bias.
Geordie McBoyne.
