Klein and Hummel SA600

This is a Klein and Hummel Telewatt SA 600

Hi,
you can find the original manual (sorry only in German):
http://www.neumann-kh-line.com/klein-hummel/globals.nsf/resources/sa600.pdf/$File/sa600.pdf

This power amplifier is one of the best ever made. It was developed by a young engineer under the direction of Reinhard Wieschhoff at KLEIN + HUMMEL in the late 1970's.
You should keep it as there are not that many produced - some in the lower hundred pieces only.

LINK:
http://www.neumann-kh-line.com/neumann-kh/home_en.nsf/root/prof-monitoring_discontinued-monitors_hifi_SA600