I don't know when he acquired them, but when I recorded acoustic guitar overdubs for Jimmy Page, he brought in a couple of RCA BA6A limiters specifically to use on them. While not being a fan of compression on acoustic instruments in general, I had to admit that they had an identifiable sound on his playing that was really nice, and I'm glad he did it.
He told a story about how he had mentioned these limiters to a wealthy Scandinavian studio owner, who promptly went on a buying frenzy for them, driving the prices up by double. I have heard this story repeated (and even mis-quoted in an article about him) as Jimmy being responsible for driving prices up. Just goes to show how little of the grapevine can be trusted.