I too am looking for some Panzerholz B-25 for a plinth project for my Panasonic/Technics SP-10 MK2 turntable. I sure could use any information you may have come up with for a supplier of this product in the US.
Good luck Sir, I wish you the best. I gave up, as all the leads I tracked down turned up dead ends.
I had a friend actually go to Germany with a car in a container and offered to "layer" the floor of the container with the wood (with the understanding he'd be driving a car over it) on his way back.
Not sure why I saved all this information, but here's a copy and paste of what he sent me while he was there.
I have done some research on the Panzerholz.
It's called kunstharzpressholz over here.
Artificialpinewoodgluedpresswood as I translate it as closely as I can.
They use birchwood as layers.
I checked the wood companies around here and this is what I've found:
This holz can be bought in thickness of 15mm and 18mm.
15mm costs €28,90 per m2.
18mm costs €34,70 per m2.
The material can be bought in the size of 2.5m x 1.5m.
That is for birchwood waterproof glued and pressed.
If you want to know more ore write that I look more into it, just let me know.
I've received a mail from a company that can sell you "panzerholz" in The States.
They have asked me to give your name and e-mailaddress in order to get in contact with you.
Not long after that, my buddy came back to the states, but nobody ever called me from Germany.
All is not lost though, seems there's a new product available in the states.
I've not used it though, and don't know how it compares to its German "counter part".
Hope this helps...
It's called "Appleply" and here's the folks that make it; States Industries