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This is the 3rd time I have posted this
What about the G connection?
G = Gate Trigger Circuit?
I'll step out here.There original question whether a discrete solution can be used to replace the IG04080 has been answered with: Yes. (because the Yamaha part already is a discrete solution).Can it be replaced with a 2N4991/MBS4991? IMO: No. (the "G" pin functionality is completely different).The schematic/simulation I've provided does exactly what the Yamaha data sheet describes. You can build a small proto-board if you like to test it live.It's now system-wide troubleshooting, which is not my thing..I attach the KiCAD design files (V6.0) plus the Spice models if you'd like to play with them yourself.Cheers.Thank you very much for all the effort you have put forward, I will always be grateful.
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