more SD-24 pics

Can't think of anything else to say looking at these shots but "whoa".

Imagine building and testing and repairing complex hybrid electronics. Lots of wire bonds.

Just the engineering on that looks like, well, a lot of work. Probably without Spice.

Spice has been around for a very long time. I first used it at Kent Instruments in Luton, around 1975.

The hermitically sealed device that John Larkin has called "a large (I think Tektronix made) IC" is probably a thick film hybrid. They were popular back then. You could wire bond discrete unpackaged transistors and FETs and get lower inductance connections between fast parts that way than you could with the packaged parts available back then.

Ghiggino, K.P., Phillips, D., and Sloman, A.W. "Nanosecond pulse stretcher",Journal of Physics E: Scientific Instruments, 12, 686-687 (1979).

Tektronix would have been more ambitious.