Replacement Trace SW FET Power Board

[Ronsine]

Hi to you all on this forum and apologies for butting in as I am not a coach man.
However I am a Trace SW inverter enthusiast in the UK and am delighted and impressed by what davidbrady has been doing with the SW4024.
Here we had the SW2612E,3024E,3048E and 4548E.
Here in the UK we are 230v and 50hz so I have a few questions...
Are the voltage and frequency of the inverters read from the pic or the proms?
What fets are being used on the SW 4024 replacement boards?
What current are the replacement fet boards good for? The SW216E draws 300a at full load

Nearly all the SW inverter failures I have seen in the UK have been failure of the "Papa bear" main transformer.These are no longer available for the "E" models from anywhere and I have been exploring replacing with a toroidal type instead of having the originals rewound.
Would be interested in any thoughts on doing this.
Thank you for your time.