I realize I'm a bit late to respond, but if it sounds good and isn't badly buggered up - with 4 CTS speakers, I think that's a pretty good deal. I'm of the opinion that those original CTS's are the best match for a SR.
I've got a 74 SFSR that I bought a few years ago, paid more for, perhaps paid a bit too much for, but for what it is and what it does, I think it was a bargain. A 74 is pre-master volume and a really wonderful amp IMO. Large and heavy - yes, but what a lush and huge sound!
Reflection upon my playing is a reminder to keep my regular job..........pays better but not nearly as enjoyable!!