Perry Sandeen has finalized a remarkable work on the Hammarlund SP-600 and its many variants. This has been a long process with input from many different people who all had something to share on this fine receiver.
It is available for download (free) on the Hammarlund Historian website. It is in .pdf format and in two parts, each being approximately 7 megs.
Look here:
http://www.hammarlund.info/I personally would like to thank Perry and everybody involved for this great piece of history on the SP-600.