I did the pre-tone board yesterday. I did change it up a bit, I had also just re-capped the pre-tone on a different 2270 (serial 9006) and I sure feel like it lost most, if not all, of that Marantz "warmth".
I do brief listening sessions after each board and although subjective, I am using the same source, same material and same speakers so it should be somewhat comparable.
On the 9006 unit, seemed like it changed the most with the pre-tone and not so much with the actual tone board.
On this #11246 unit, I was hearing about the same - tone board changed the SQ slightly - seems less warm, less muddled. But overall, fairly well balanced. I think these old Marantz run a little on the muddled (warm, blanket over speakers, etc) anyway, so I like having a little better "clarity".
But not so much, like the way the #9006 turned out - as I said, it seems to have totally lost the warmth and while testing on some Cervin-Vegas, I almost felt like I needed to turn up the bass. Don't get me wrong, I think this #9006 sounds great - very clear, low noise floor, good separation - it's good SQ. But not warm by any means now.
At any rate, on this #11246, I decided not to use all C0g caps, four of them were swapped to Nichicon Poly Foil Type Film Capacitor's (these are the yellow ones in the pics). I *think* it made a favorable difference compared to the other unit. Quick listening test, seems like it maintained a little of the warmth. I'll have to bounce the units back and forth for a bit and see if I'm sure about what I think I hear.
Oh, and the 1uf's aren't C0G either, they are a normal poly cap. I didn't have a WIMA or C0G to fit.