Which AMP to Keep ?

I would definitely keep the Pass and sell the others. 

I liked Sumo amps a great deal in the day. The problem wiht all that vintage gear is that it may be seriously outclassed (or not) today and the power supply components are aging and will need significant maintenance.

The usual neutral, affordable amplifier standby’s are Parasound Halo amps. I’d listen to those and if they don’t sound much better than what you have use your own judgment about what to keep, but plan on recapping now rather than later. Otherwise sell everything and get the smaller 100W/Ch Halo. I forget if it’s the A21 or A23.

Remember that amps are bad when the caps go.  They can have cascading failures that leave you with lumps of metal you can't get fixed, so whichever amp you are keeping, at this age they need to be recapped.

clean, box  up ones u don't use. and store in your house.

i very much felt like crap, after selling many, many components when we moved.

i still miss the onkyo grand integra  tuner, onkyo tx 840 and 860 receivers, the rotel rb1090, from which the buyer from egay, was a complete a$$bag, 

few other pieces as well. old  jvc cd player, older technics EQ, some Infinity bookshelf speaks, ....

if you sell, you will regret it.

None

I’d love to say keep the Sumo, but there is NO one who can/will service it anymore.  I have an Electra preamp that lost a channel and would love to get it fixed! 

All the best.