I've recently purchased a set of S75s which I plan on giving a slight overhaul. They look pretty good for soon to be 40 year old (wish I looked that good) so nothing major planned: New caps in the filter, some slightly upgraded internal cabling (usually In-Akustik 1.5mm2) and clean and oil the veneer as there are no major scratches or anything. The stands looks decent too so will be stripped, primed with zinc cold galvanize and then a quick coat or 3 of light grey/silver. Here's a picture of a set of S50 stands I did (same recipe)
https://i.imgur.com/xycDC4X.jpg
I usually don't listen too much to speakers this old, not until I've done the electrical part of the restoration - only hooked them up to make sure all drivers were working (which they are, happy days), but from what little I did hear, they sound decent so there is definitely potential*. One thing I've read more than once, is regarding the slightly loose bass- one thing is for sure, they are nowhere near as "tight" as my restored S120s - but there is one obvious thing I think can somewhat remedy that: The cast plastic front is slightly wobbly: probably able to give 2-3 mm in the center (around the top of the woofer), and I know enough to know that that is not a good thing. And there is a super quick way to at least partly fix this - more pictures when done.
Another thing - that filter :D Replacing the caps will be massive fun I think. Well. Maybe not. Considering adding a second piece of fiberboard to the bottom.
* When I first hooked up the S120s to check the drivers, I nearly got rid of them right then and there. Now they've replaced the restored Beolab Pentas as main speakers - night and day difference.


