Oooh! I have one of those combos itxs imaginatively called a 1110 (gp11 + 10" speakers).
Mine sounded a bit rough and needed the matched transistors in the front end of the power amp replacing.
It's also got the 'wrong' psu from new, so I was able to add an extra pair of NOS mosfets to unleash unimagined power levels...
I'll add more to the story. It had Eminence Beta 10s (maybe not the best choice) fitted and one was reverse polarity so swapping its leads around greatly helped.
It weighs about 96lbs so I added 50mm castors, which lasted a couple of months. So I fitted heavy duty 75mm ones.
Bought it from a lad in the midlands. He had a mate there who had helped him move it. They offered to carry it to my estate, and where aghast when the old fart picked it up and put it in on his own. Sometimes it's not strength it's just knowing how to lift safely, but 'it made I larf'.