I would strongly suggest upgrading the parts ,the wiring is-old and brittle , the resistors are cheap cement type and capacitors low quality and for sure dried out
Having owned a Audiostore for a decade and rebuilding these things are very apparent especially knowing it’s age ,for sure it will get worse ,it may work but detail is far from optimum ,capacitors back then dried out after 15 years and detail just fades and sound far better after being refreshed and upgraded
just sound advise.