nope. i can count on one hand the number of pots i've replaced...and it was because they got dropped and broken. some of the REALLY old u series and 7400 chassis had substandard pots that need replacing, but the 7500 should be just fine.
replace big non-polar cap, its like 2.2uf 50 volts...something like that. that's the main culprit for no width adjustment. but you may as well change them all.