What a wonderful thread. Thank you so much Martin for all the photos. Now I've caught the bug, and want an old vintage scope as a showpiece for my workbench. I promise though, just one for me. I won't start hoarding old scopes and make them less available to the serious collectors who so lovingly spend so much time restoring these beauties.
I think the Tek blue will go well with my original IMSAI 8080 blue, being presently the only piece of vintage gear on my workbench. I never imagined such a wide selection of old vintage scopes existed, though it certainly makes sense when you think about it. Now I just need to decide which one to get. I'm not looking for it to necessarily even be working, rather I just want a nice looking piece of vintage gear to gaze at when I'm working and contemplating some problem/issue. I love the old Tektronix logo, the scopes with the red knobs, and the circular CRT tube. But I don't want it to take up too much space. Seeing your photo of the 515A, I think that model might be a good match for me.