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Hello Mick,
I bought a ferroresonant transformer myself at that time, but these devices are only with small benefits at least for us and then they are also very rare. I have examined the transformer and tried everything possible also the diode plug. Then I got myself a small 3 phase transformer for small money and it also operated as standing wave generator, it is only a little more difficult because the magnetic shunt is larger and less energy is transferred to the C phase, but also a little more economical what the active power for the operation is concerned.
My problem is to synchronize everything, so that both diode plugs are the same, I think the push-pull windings must be the same, I still have to work on that. The pure function of the circuit works flawlessly and in the right setting, the energy is not reflective to the source, I've already done that. The impedance of the load must be very low, you can hear it already switching the semiconductors it is getting harder, then even the input power is additionally consumed down.
But I consume additional active power when operating the diode plug, which I think still needs to be greatly minimized.
At the moment I have little time to experiment again.
I can only recommend to anyone who wants to build it to work with large semiconductors, everything else is destroyed or overheated after a short time. With 200 amp diodes and thyristors everything stays cool.
But I'm about to rebuild the diode plug platform and to structure everything better and to build everything short and symmetrical line technology.
It's an interesting experiment, with very destructive energies. But I think it is the simpler system, even if it at first glance most complicated reads.
regards
Sven