Hey, really cool amplifiers.
Forget about repairing that horn , he he; coupled to a transistor amp it will be "angry bees paradise".
I see 5 power transistors, so presume a transformer driven quartet.
Now SS transformer driven amps do crunch well and show quite a few "tube" characteristics
Mainly having speaker load on their collectors, same as tubes have their load on plates ... while OTL amps, both Tube and Transistor, have loads on their Cathodes/Emitters, a world of difference.
As in "muscle" vs "fluffy soft".
Please show a couple gut pictures.