Jazz for aficionados

You got it! Happens all the time.

Perhaps not so much in this case. They are co-leaders and I’m sure that was the intention. Notice the order of the names; alphabetical, the default way to do it when the performers are to be considered equals: “Cannonball and Coltrane”. “Adderley and Coltrane” doesn’t have nearly as much ring 😊. Other records that shall remain nameless....what you suggest definitely happens or are factors.

rok, a word of caution with your Yamaha. I’m not an EE or a tech, but electrolytic caps go bad with age. There is no universal life expectancy I’m aware of, some say 10 years, others say 15. The point is they will leak or fail at some point. If your Yamaha is 35 years old there is a very high probability it will have problems. It may still play but it certainly won’t perform at its design capability.

The fact it has been in a closet (not being used) makes the problem worse. Capacitors need to be charged (turned on) with some regularity to last as long as possible.

I speak from experience. I had two amps in storage for some time before I got around to selling them. Both were more than 10 years old and both had been idle the last few years. Both also failed on turn-on and required repair to sell them. And yes, both worked fine the last time I tried either of them before setting them aside.

Sorry but this also raises the question; how old are your HK and Marantz amps? If either is 10 or more years then even though they work they may not be up to their designed performance. Restoring any of your amps should cost much less than buying a new one. But if you do consider a new amp I would say one of the Parasound models should be a reasonable choice.

PS -- I think you hit upon the answer to the "Somethin Else" album credit.

Rok, have electrolytic capacitors replaced on anything over 10 years old if you want it to sound as good as it can.

Yamaha from the mid 80's ain't worth fooling with.

Pryso gives good advise re amps.