I played around with the 49720 and the opa 1612. The quality change WAS SIGNIFICANT for the better. However the amp died eventually. I only did this because I was making the B22 amp. I have yet to learn more about amplifiers and touching this amp was not a good choice for me. It was an expensive lesson. Don't touch it unless you know how to match the opamp with the existing circuitry or modding the whole circuit itself.
4/27/14 at 12:22am