"RB" wrote in message
...


Thanks to Steve, Jim and Harvey for all the suggestions.
Ive spent a few hours on it today and have got both rails working within
specs.

-15 Volt rail was a crook 1458 Op Amp (some time was wasted trying to
desolder it from the top of the PCB till I realised it was in a socket!

-8 Volt rail was a dud electro.

All working now, triggering perfect upto nearly 400Mhz, only fault is trace
has some 50Hz "wobble" in it, Id say maybe replace all electro's in psu????

Are the values of these electros important????? ie, across the -8Volt rail
Tek have used a 5500uF, at the moment Ive got a 6800uF tacked across the
bottom of the board, Id never be able to find a 5500 cap but could probably
source a 5600 locally...is it that critical???

Thanks again