I found a bunch of Guitar Players that I forgot about. I'm reading Vol. 1, No. 2, October 1967, which is an interview with The Who prior to playing at Monterey. It is pretty informative, if brief. At the end of a discussion on recording, Townsend mentions using a Grandpiene reverb unit, which he prizes for its distortion, saying that "it gives a kind of clear fuzz dirge. I like a slightly broken guitar sound." The early GPs were notoriously bad about typos and misspelling, so who knows what "grandpiene" really means? Ideas?