how long with a PSaudio Preamp last

According to Paul they both expire in approx. 11 years.

DeKay

yea, he told me 20 years for the preamp.....i was hoping to put my retirement system together. I know Bryston has a 20 year warranty

No reason to expect less than twenty or thirty years.  To keep top performance, it would be good to have them serviced after 20. 

I think they both have a tube stage that need to be changed every 2 years. Ask ps audio they are the best source bascom king and Annie nudel made that stuff it's very good.i have some and love it.they also sell the tube's. Ebjoy the search