got wick and desoldered the 6562 .. it was very tough and i thought i burned it but it still works (i accidentally touched the plastic part of the TUNE pot, now the knob cap won't go in grr)
socket's in, tested LM358 - slightly better but still not good enough (the lowest 2 notes were off)
tested TLC272 - right.. it's audiably good (haven't measured the exact freqs or anything)
btw, i also soldered something like a sort of socket for Q8, tested a few transistors i had..
most didn't work (the square wave output is just a little queter and it sounds more like the sawtooth, sothe transistors didn't change anything..)
surprisingly i put a small guy with the label "A1267 GR" and
sounds the same as my A733P