PY 81 as power rectifiers?

[Amie]

Looking forward to next post!

Hello kalee 20

As more current was drawn from the second winding the frequency response improved. At the point 4mA was being drawn it was -3db at twice the bandwidth of the unmodified circuit, it also seemed to be the point that provided maximum output versus total current consumed, I think that's the trade off,  sorry it's a little unquantified, I was just using a sweep function generator and 'scope.

200volt supply and 20ish mA consumption....I worked that out as 15% efficiency for the output I was getting. However, if the current that was being used for balance were decoupled, it could power the rest of the set, the design I have needs only 100 to 160volts to work successfully.

This really is all about core saturation I think, a good method could be made of it, but a proper gapped transformer would win every time.

I have no data on the hum cancelation issue in this circuit as yet...

I've included the diagram, its the Grundig one and I butchered it in MS paint. I've added the values I used....I hope it can be read, its a bit scruffy.
   
Time for some beauty sleep, I'm past bed time curfew  

Amie.