Used amps, how to tell if,,,,,,,,,,,,,,,,,,,

thanx flying997. You've answered my original question fully. I now feel that I have a more comprehensive knowledge of what to look for or listen for when deciding to buy older electronics. 

Not that the other inputs aren't appreciated.

What's a Magnepan 7.1?  No such model.

Most Maggies will work better with more power.  IMHO, at least 200 watts or something with very high current capability.

Are there any reliable high end repair shops in your area?  Why not ask a tech if they have reconditioned amps that fit your needs. Boomers are dropping like flies if you haven’t noticed and their survivors are disposing of their antique stereos all over the country.  You want something vintage?  Look for an Ampzilla or Dynaco 416 and get it restored. Otherwise you can get a brand new NAD C399 with 180/Chan of N-Core power for 2 grand with 3 years warranty. 

What do you mean by caps?  I am sure I am not the only one who doesn't know what the term Caps means.

Maybe OP means Magnepan 1.7? What amplifier are you currently using? Many good 200 watt/channel amps are available. Mark Levinsons are great amplifiers but overpriced for your budget. How about more info on your listening preferences and room size.