I've owned a MC2505 for almost 30 years, purchase in 1989 from EZ Teletronics in Chicago (defunct). Didn't run it much for many years and it stayed in the carton, but lately it's been playing in the 2nd rack (in family room) nearly every day, sometimes for 6-8 hrs each day thru the XR6s.
It got a `home restoration´ in 2010. Mainly these amps
need electrolytic cap replaced.
Here are some of the NEW caps that were installed:
The
MAIN PS caps were ok, so they are still original. It got a thorough `going over´ removing oxidation, deburring, screw replacement, etc.
Replacement (rusted) screw:
Deburring:
Burr around hole cuts paint/finish on mating part:
Original barrier screws:
All barrier screws replaced:
Chassis screws replaced with stainless black oxide:
Power output and meter tracking test setup:
After update and restoration:
More photos and tips to post if you'd like.
-Greg
Note: photos uploaded to AK appear blurry, image resolution way out of spec!