I have an LX-900 along with the upgraded version of it in the Runco LJR II (also had an LJR I at one point too), but I've never seen an LX-H670 in action.
I will say that I found it odd that when MSB made their LS-2X Silver LD player with the built-in RF Demodulator, they apparently used the LX-H670 for it.
MSB LS-2X SilverMSB, by the way, were the ones who modified the LX-900 into the LJR I and II for Runco. So it's possible they tweaked the picture on the LX-H670 for the LS-2X Silver.
Unfortunately, I've only ever seen an LS-2X Silver for sale once off of a home theater installation service back in the early 2000s, nor have I ever from anyone who's owned one.