I might be buying this old preamp from someone. The guy says some of the pots are scratchy and that one doesn't even move.

If I was able to find replacement pots would it be as simple as desoldering the old ones and soldering the new ones in?
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Scratchy can be solved with contact cleaner most of the time so i would see which are stuck and which are scratchy before you replace them all unless your just bored.

And its a pretty simple task just unsolder and re-solder. And make sure you get the right ratings and dont mix up the pots..