I'm generally not in agreement that your amp is near the end of its life. I have two Yamaha amps from that period and they are both out-to-equally performing in comparison to some of the much newer and more expensive amps I've had chance to hear. The older Yamahas were built very good, and, they had rather good phono capabilities.
An upgrade to a good used Music Hall 7 or one of the lower end SOTAs could be worth exploring.
An upgrade to a good used Music Hall 7 or one of the lower end SOTAs could be worth exploring.