Regarding the "old one", a VA Systems Model Two amp from the early 1970s, a prospective buyer should be aware that there are no service parts available for this unit so we can no longer maintain or repair them. If it works fine, great, but if not, it is a boat anchor.
Regarding the "new one", a Transcendence Eight vacuum tube preamp with remote control, this looks just fine - - - BUT - - - I could not find a record of selling one to anyone in the San Francisco area in or near the time frame mentioned, August, 2008. Thus it is possible this would be a third hand unit now and thus the original AVA factory warranty would not transfer further. I can be more helpful if I knew the seller's name.
Regards,
Frank Van Alstine