Thanks for all the treplies guys. That explains the isolation thing.
Eric I have thought about using the old drivers. I have replaced all the transisters, and they seem to be working fine.I just havent found the how to yet. I have seen the schematics on this sight but they are quite vague. If you have any links I would greatly appreciat it.
I think I may buy a isolation bord to do this with the option of going to geckos in the future. Would the PMDX 131 work with the old drives then later geckos?
Stephen