MR 74 and C-28 are fine compatability wise. Both SS and decent sounding. My Dad has the C-28 with the MR 71, but also has several Fisher tuners as well, all with no issues. Just wondering why you might feel there would be compatability issues?
The MR 71 although a 12 tube design, and the SS 77 are somewhat better sounding than the 74, however they would be several hundred $$$ more than the 74. Dont pay more than $400.tops in exc. cond. IMO
