Have the units been exposed to high humidity? If so, look for corrosion on contacts resulting from the humidity. Also, check the cones for warpage and/or age induced deterioration. You may wish to simply replace the electrolytic capacitors rather than trying to determine if they need replacement.
A couple of years ago, I gave a killer stereo system to my nephew for complete restoration. The SX-1980 Pioneer receiver was in almost perfect condition, not even needing to be recapped, but both the AR 3a and Dyne Audio speakers needed lots of work due to humidity even though all had been professionally resuspended about five years previously.
He and my brother, both Purdue EEs, spent many hours working on the system restoring it. Most of the time was spent on the speakers. They were able to find all needed information on the net.
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Today's Featured Article - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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