I have been helping fellow AK member Tom B. go through all the original Fisher plant test equipment from the tube era days. I understand that Tom's friend owned the plant a some point after Fisher sold out. Tom found a 500-B and 400 receiver in boxes with all the test equipment, so I decided to restore the 400, and Tom the 500-B. I also grabbed a Bogen RF20 amp we found, and some other goodies. Glad we were able to rescue some items before the dumpster got them.