Taylor Model 60 signal generator

[Sinewave]

Actually ignore the above about this having 6 and not 5. You'll see why below.

I de-soldered everything to make some measurements.

Results are

Between 1 and 2 = 47ohms
Between 1 and 4 = 450ohms
Between 2 and 4 = 404 ohms
Between 5 and 6 = 170 ohms

I couldn't get a thing from terminal 3 to anything, so I suspect that it's only used to terminate the end of what I've labelled 6.