there is one that has been reconditioned on the local South African forums , see this thread
Send a Pm to both Kent Kassler and alternativeroute on the forum as they know a lot about the amp
http://www.avforums.co.za/index.php/topic,31962.0.html
I owned a UR Primo for a while. Very good amp (although the MC stage was noisy).
The valve should last 10K hours and only costs about £15 to replace.