I recommend the video "Printing with Fred Picker" usually available on eBay. It's a good demonstration of how a good printer got good prints, and seeing is believing. Produced in 1989, it's still valid, even though it could be updated to cover variable contrast paper and filtration (but won't be, Freddie's dead, as the old song says).
His assistant is pretty cool, too. Although older now, and bulkier.
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