A bit late on this, but thought I'd offer my two cents.
The Parasound 2205A is an 80 lb. beast of an amp. All of Parasound's amps during this era were designed by John Curl. Evidently, even their newer high end amps use this same design described here:
linkto[ audioholics ]/amplifier-reviews/parasound-halo-a-21/halo-a-21-amplifier-build-quality-continued]
(sorry not enough posts to make a direct link)
This description of the current amplifier, the $4,500 A51 matches identically to the internals on that 2205A.
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So, great Amplifier.
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Would I buy it for $500 today? Probably NOT.
Why?
The capacitors on that amp are getting close to 20 years old. No matter the quality of the amp, those capacitors are the weak link. They WILL start failing on you.
I lost my first channel about 3 years ago. I am an electrical engineer. Obtained circuit schematics, and I replaced that channel's massive supply capacitors.
I transitioned that system from a 7-channel (with a Parasound HCA-1000A for surrounds), to a three channel setup a couple of years ago. I lost three more channels in that time (again, capacitors).
Although an EE, I suck at soldering. I found a good local place in Houston in a strip mall. I checked out the back room, and it was filled with McIntoshes, and even Classe stuff.
So it cost me $700 to replace every capacitor in that system. It is now purring along once again.
It worked for me, $700 for an amp that I will likely get more years out of.
But if you buy today for $500, that amp will likely cost you $1,200 with the soon-to-be capacitor replacement cost.
Even then, it may be a great deal. But then Audioholics reviewed this new amazing Monoprice Amp:
linkto[ audioholics ] /amplifier-reviews/monoprice-monolith-7-channel-amplifier-review/conclusion
$1,600 for 7 channels in a beast of a chassis? I think you can get a 5-channel of a few hundred less.
So for $700, (me), a bargain to keep it.
But for $1200? I would go with a new Monoprice in a second.