If you are a real "purist" the only thing close to the "real" thing (B3) is the KX5 Hammond .
But if you have a small budget there are also some good modules like the new Crumar MOJO Desktop Tonewheel Organ Module

I. smile
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Genos2,Korg Pa5X , Yamaha YC61, Ventilator2 . : https://www.youtube.com/channel/UCmC6hdAR1v5lYN8twfn0YbA