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 - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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