Purity Rings

Fudd

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Do i absolutely need to swap purity rings when doing a tube swap? on my donor tube the whole yoke and purity rings are all one assembly...on my old tube they each removed with 1 screw.
 
From what I've read, each set of purity rings is set up for a specific tube. You mark where the rings go on your new tube and slide them off, then replace them once you place the yoke into place. Don't forget to mark the rings as well as the position on the tube so you can line it up perfectly.

You /can/ use other rings, but then have to go thru the process of lining everything up again afterward.
 
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