ORIGINAL: 2slow2matter
Reversing Y's are horrible. Everyone I've ever owned isn't worth a crap at holding center. You will be forever adjusting the pot on it.
Very true.
They all seem to use their own frequency generators that is clocked via a crystal.
In turn the crystal drifts with temperature changes, so no matter what you do you end up wearing out the pot's wiper arm contact points, resulting in progressively poorer centering & control.