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probably the weaker sets need an alignment. The caps and stuff drift out of spec after a while, and the IF and RF cans need a re-peak to perform optimally. I've done it just by tuning in a weak station mid-band, and tweaking the cans till the station was at it's loudest, but its not the ideal way. Best method would involve injecting a carrier at the IF frequency and tuning the IF cans with an o-scope, but generally speaking the earhole method for AM sets works acceptably.
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Random bits of stuff in the collection:
Yamaha YP-D4 turntable with B&O MMC 10E cart
Allied 495 receiver
2 Magnavox amps, AMP150 and an AMP178, currently under the knife.
Onkyo TX-4500
Onkyo Radian III speakers
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