[GRe]

Has anybody tried or seen a SE topology as shown below?
(Put reader to Courier-New font to view the schematic)
I'm asking because for a fun project I'm trying to get
an idea whether the topology is viable or not.

T1 is a transformer without gap. To cancel the field in
the core, caused by the primary current Ip, a current
Is of opposite direction, with a current value of Ip*N,
is imposed upon the secondary by a constant current sink.
N is the winding ratio, V+ is a regulated voltage.


Ip -- T1 Is --
+----------) | (----------- V+
| ) | (
V1 | ) | (
--- ) | (
--- ) | (
--- ----o---) | (-----o-----||----+
Vi ----- - - | | C1 |
O B+ | |
| | |
| | |
| | |
+-----o | | /|
| | +---+ +-+ | Spkr
- +-+ |CCS| Is +-+ |
Cc - | | Rc +---+ | \|
| +-+ | |
| | | |
| | | |
+-----o--------------------o-----------o
|
--- GND


I have a pair of line matching transformers handy with
a 22:1 winding ratio on the end taps, Rsec. = 0.7ohm,
Rprim. = 188ohm and a max. power handling of 10W.
Onset of core saturation is at around 115Vrms at 50Hz.
Primary inductance measures 73H at 100Vrms and 50Hz.

With an 8ohm load total Ra, including loss resistance,
will be around 4K4 which is a good value for an ECL82
operating at a B+ of 200V and a plate current of 35mA.
For this plate current Is needs to be 770mA, then the
power dissipation in the transformer is about 0.65W.
I don't think this amount of power causes a problem.

What could be the pitfalls of this topology?

Rgds,
Gio