K5TR has some recordings of Dick Norton, N6AA (ex.W6DGH) working the ARRL Sweepstakes CW in 1973. Listening to everything from WA1MZV’s chirpy signal to K4LDR’s clear signal makes me wonder what these OM’s rigs looked like. If I think of it, I need to check the W7DK club QST collection to see what equipment was being advertised in the early 70’s.
UPDATE! Believe it or not, in one of those Sweepstakes recordings I heard my contesting Elmer Rex, K7QQ (ex. W5QQQ/7). Their QSO is about 8 and a half minutes into the second hour recording.