The Systron-Donner 100A Pulse Gen. has been fixed as suggested earlier, the output transistors have been replaced with more modern, faster and higher power devices. It works very well now.
Was working on an old Fluke 8000 DMM – appears to have a damaged special IC, so probably not repairable unless another broken 8000 turns up!
I have a faulty Fluke 1900A counter on the bench now – having another working unit allows testing of socketed special IC’s and the front end ECL module – they all work so the problem is somewhere in the main board TTL/CMOS.
The Tek 2430 is gone (sold on eBay) had obscure problems that were going to take too long to fix – Uni Tri. 1 starts on Monday 20 Feb, and I didn’t have the time/space..