On Jan 19, 2012, at 6:50 PM, <bill.spencer at northstarstudios.tv> wrote: > I will trade two Ampex MK-10 heads for one MK-15. One is an Ampex rebuild and one is an RCA rebuild. I point out: Doesn't sound like a fair trade to me. Two Mk-X heads should be equal to a Mk-XX head. ;) Dennis Degan, Video Editor-Consultant-Knowledge Bank NBC Today Show, New York