I fully agree that 755Es need some sparkle atop, but I'd go with a pair of Pioneer horn tweets as a poor man's 3000 substitute.
As second choice, I'd opt for 2" Peerless paper cone tweets with the aluminum dustcap.
A friend of mine got heavily into scavenged 8 track in the 90s and manged to find all sorts of highbrow jazz on 8 track. He even had Sun Ra 8 tracks. Wouldn't have believed it if I didn't see it with my own two eyeballs.











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