Guys:

Got a replacement transformer from Gary at Play Things of the Past. He did LOTS of work trying to find a replacement for me that not only worked electrically but mechanically as well. Tough to find multiwinding transformers with TWO 2.5 volt secondaries of the proper current rating!!

So now that I am wiring it in - one question.

I assume that it does not matter how I have the 5 volt winding phased - I can pick off the HV out of EITHER side of the 5 volt winding right? ACTUALLY it looks like the HV DC is developed on BOTH sides of the filament from the rectifier. Also , I assume that the 5 volts of AC due to the filament is filtered out just like the appx 450 V of DC? I never really thought about the 5 V of AC being an issue but since I now have to wire it - I was curious.

Also I assume that the HV is dropped relative to ground on the load resistors in the same line AND of course the tubes as a load.

Thanks
Lou

There is no "phasing" of the rectifier heater circuit- you can pick DC off either heater pin. Since the rectifier heater winding is not referenced to chassis ground it is effectively transparent to the DC voltage being created.

Thanks

I just wanted to hear it from someone else.

Haven't worked power supply circuits that often.

Lou

:There is no "phasing" of the rectifier heater circuit- you can pick DC off either heater pin. Since the rectifier heater winding is not referenced to chassis ground it is effectively transparent to the DC voltage being created.

Sir:

Does any of the 5 V AC ripple get thru the DC line and onto the plates of the tubes? OR is the 5V AC filtered just like the rectified AC?

Thanks
Lou

:There is no "phasing" of the rectifier heater circuit- you can pick DC off either heater pin. Since the rectifier heater winding is not referenced to chassis ground it is effectively transparent to the DC voltage being created.

Hi Lou

Not having a CT will make a slight difference. One plate of the rectifier will effectively have 5 volts more than the other. Rectifier current won't be exactly balanced. Doesn't matter but if it bothers you can make a center tap using wire wound resistors off each filament. Connection of these resistors will be a CT.

I made an oscillator where I could turn off high voltage winding of the power supply. Was surprised that the osc continued even with HV off. There was enough voltage rectified from rectifier tube filament to keep the osc going.

Norm

:Sir:
:
:Does any of the 5 V AC ripple get thru the DC line and onto the plates of the tubes? OR is the 5V AC filtered just like the rectified AC?
:
:Thanks
:Lou
:
::There is no "phasing" of the rectifier heater circuit- you can pick DC off either heater pin. Since the rectifier heater winding is not referenced to chassis ground it is effectively transparent to the DC voltage being created.