Who services older equipment?

Try Mike Zuccaro 8795 Corvus Place,San Diego,Ca 92126
Phone# 858-271-8294

You didn't mention your location Jim; but a good place to
start might be your local McIntosh dealer. They often work
on older Mac equipment from the late 60s on - and if they
can't repair your gear, they will often know who can.
I just recently had my MR-73 Mac tuner (a late 1970s
unit) completely refurbished; and my local Mac service dept.
was able to get a replacement part that is no longer made
or carried by McIntosh quite easily. The tuner now works and
looks like new - and the reception is wonderful.

first of all where are you located and how much you're willing to spend?
most of such shops will charge you upto $150 of labor + parts.

i can be in help fixing for you these units for $100 each of labor + parts, but i'm not sure if you will spend such money for the old unit + round trip actual shipping(i do the fixing as a home technician and as hobby as well)

i checked ebay on your items and i believe that it's not worth to spend money and/or send it for the repair rather than hunt a little-bit on these units on e-net since they're in the range of $150 in average.

www.classicaudio.com