That's a REALLY nice deck! Kinda reminds me of dad's old KX50 MK2, except yours is higher class, a real thing!
Unfortunately no, the one I got at the moment is nowhere near KX50 and/or especially your KX-600. Model number is KX-W4080. A fairly modern unit, mostly made out of plastic. Unlike some of the (even) cheaper Sony decks, it has two separate mechanisms & motors, I'll give him that much ... but other that it is a lower end "consumer" grade unit. You know, "Set & forget" type of deck, where you play the tape & enjoy music indefinitely, since it has auto-reverse & will play tape(s) over & over again. Which is why I said so in one of my earlier posts, it required a lot of TLC to get it up & running again, to the point where it made me wonder if it was worth the money invested in all the parts & cleaning materials.
I also got couple of other decks laying around (Dual CC8010) along with Aiwa AD-F550 which used to be my main deck up until I got CT91a. Both are fully operational ... or at least they've been fully operational last time I used them. It's been couple of years ever since, so there's no way of knowing for sure, not without hooking them up & testing.