In the 60's and earlier power relays were almost unheard of.
Personally, I think you'd be better off replacing the caps on the original amp/preamp chassis. Get a Sam's photofact for it, order caps based on the parts list, and solder them in....When I have the chassis for such a set on my bench I normally have the caps changed in under 4 hours....Can be 30 minutes or less if I'm focused and on a roll (especially simple chassis).
Audio circuits are not terribly picky...If the tubes are good (likely), the resistors can be off tolerance and many things can be a good ways off of ideal, and the effect on performance may not be noticeable.
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