amazon has been trying to get me to bundle separate items into single boxes, single delivery for a few years. It worked back then.  NOW? they don't even ship until four days later no matter what. Oh and every item is in it's own box.   To top it off they say it is delivered when there are neighbors, real couriers, bambi, possums or whatever out there... on video from the doorbell to the phone to see.   "they" aren't on video, I deduce because they did not leave it at my front or back door. amazon will no longer ship me any Bar Harbor natural New England Clam Chowder after two delivered (they say) items were not delivered to me.   &*$% `em just got my Blue Crab Bisque straight from ME!! Been on prime for over a decade, looking at alternatives since they hate what I love here anyhow.

PM Me, I know you can repair the amps. 

Hello all Still research one K-31-K original for sale For my KLF-30 pair In advance thank you for any help Moolenacker 

Bump Still looking for a new home.

It´s me ..no doubts 😂 I´m not a clone or a KI 🤣      

I too used the Trade Secret for repair touch ups on other woods and it worked fine for certain types of defects.   With all due respect, the tree-hugging propaganda surrounding the VOC crusades that started in the 80's was unscientific and unsubstantiated to this day. The $ trillions in economic impact eliminating so called ozone killing chemicals hasn't resulted in any loss or gain in the ozone that can be distinguished from random chance. You'll never see that reported anywhere ... nor do you hear any more fear mongering about the ozone destruction and the end of humanity. The industry has found another more profitable boogey man.   Sorry for the rant

Thats a nice summary, thanks for posting. The literature I got with my Klipschorns was non-specific, just a fine furniture oil that does not include waxes. I tried a few from furniture stores, they were ok, but the Watco is superior.   The yellow lemon oil product tends to attract mice, until they met my cats

If these are still unfinished plywood as they came from the factory, then it depends on what you intend to do.  If you want to keep them in "raw" (unfinished) condition, then just dust them.  Putting anything on them will cause it to soak into the wood.  However, applying a finish of some kind will protect the wood, especially from getting stains.  You can apply almost any finish with or without staining them first - lacquer, polyurethane, varnish, etc.  I presume you could even apply furniture oil to the plywood to create an oiled finish, although I don't know how even the absorption of the oil would be on the edges since there is glue between the layers of the plywood.  However, most people who purchased speakers with raw plywood usually applied a sealed finish like poly, lacquer, etc.

As far as I know, these multiplex woods are also finished with a veneer. For example, next week I am buying a 1973 Khorn made of birch plywood covered with fir veneer. But just “raw”. So no oils in this case?

I'm a big fan of Trade Secret products.  Their Scratch Remover did an amazing job restoring the finish of my lacquered modified Belle Klipsch center speaker.  The furniture polish also saved me from returning my Heritage Jubilee.  There were a few spots on the veneer where when the light hit at a certain angle you could see light marks where the plastic bag of the packaging had touched the veneer.  I suspect the lacquer wasn't quite finished curing before they were packaged.  Applying the Trade Secret furniture polish made those disappear.   However, I don't think this, or most other furniture polishes, would be appropriate for oiled wood finishes.  Even the product description implies that it is for sealed finishes ("From French finish antiques to modern lacquered and synthetic coated furniture...").  You are only supposed to use furniture oil products on oiled wood if you want to retain the original appearance.