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<DIV>How about <A href="http://www.largentvideo.com">www.largentvideo.com</A> as
a source. They have all sorts of older GVG equipment and provide repair
services. But 900 series are from the 1960's so I do not think they are
even worth looking at as a useable device. The RS-170 A specs were not
even thought of at the time these came out. Rise times are an issue on
some of the devices.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV></FONT></BODY></HTML>