I like that crossed out if
Yep, it was a pain to make and I'm not happy with the result. The replacement plug doesn't fit the original HP shroud and a search doesn't turn up anything based on the part number - I suspect it's a HP special. I'm thinking of ordering a replacement DSUB connector and remaking the entire thing rather than using the original cable - at least that way I'll be able to put the shrouds on!
I promised to post a listing by wire colour but it's done now and I dare not disturb it too much. The yahoo group document was an immense help - I established that I'd only made a mistake on three wires. It was relatively easy to check continuity from the DSUB to each wire at the other end and the document was correct so I think anyone else needing to follow this path can get there more reliably by using it rather than a colour table.
The analyser is now up and running - next fault to solve is that the resolution BW's below 3 KHz don't work - no signal at all. There's no 18.4 MHz signal coming from the Step Gain Assembly into the Bandwidth assembly and someone's been there before me - the crystal is a ring in - not the original part number and you can see that they've soldered a new crystal in. It *is* an 18.4 MHz crystal by it's part number. It's a pretty simple circuit and the transistor checks out ok. I suspect I need to mess around with the factory select component values in that part of the circuit.
The self-cal won't finish without the res bandwidths working so I don't yet have an idea of how well the rest is working though it looks pretty flat across the range on my HP 8540B (500 KHz-550 MHz).