I checked the specs of the 2N3055 and PNP3055 and compared to the original they have somewhat higher specs so these should work fine in theory.
I'll order a couple and try it. Would there be anything to loose if things go wrong (i.e. the yoke ?).....??? Could I replace the yoke with a likewise "load" for the transistor to test them without directly burning the yoke...?
One idea that went through my mind: would it be possible/desirable to replace these power transistors with MOSFETs ?
In theory these should stay a lot cooler and are much faster than the original bipolar transistors. However, I do understand that "regular" bipolar transistors are better in delivering high currents ?
Any ideas about this, would be interesting if it would be possible.