Hello<P>I picked up a Hickok 550 X dynamic tube tester at the Kutztown meet over the weekend; it didn't come with a manual, schematic or tube data. I was hoping someone might be able to point me in the direction of any information to help get it up and running. I understand it is also known as an OZ (Navy). One reference on the web indicated that tube data for the I-177 tester might be interchangeable with this<BR>model.<P>Thanks!<P>Brett Saylor<BR>N3EVB<BR><P>------------------<BR>