The SU-2300 was a very modern looking integrated amp for the mid-70s and more or less started the mini component market. It also harked back to a time when a hare's breath below 1% THD was considered acceptable (at least on budget models), and all the better sounding these were for it, as they weren't strangled by OTT amounts of negative feedback.
Assuming that it functions properly, I think you'll be surprised how good a little 10w/ch from this period can sound.
Then again, you had that Philips 520 integrated for a while last year, didn't you?