Colyn,

     Not a 55x, it is a S-Tec 50..  Which resistor ?? Don't know exactly whether it 's in parallel or series with the existing Altitude Hold circuit.  Originally S-Tec sent me a box with a varying bunch of resistors to try, no one of which did the job in the altitude hold in all configueratons of Alt, Load, Speed etc, therefore a gang potentiometer of resistances from 17 M to 43 M ohms...which did work for a couple of years, then the wires worked loose from the controller as they existed the box, Held by RTV. Several trips to Mineral Wells, ( it always had to be a harness problem,replaced twice) before they found the two external wires were shorting an internal 5 pico fuse in the Alt Hold circuit.   From the LN List somebody had 34 M 's work, so the last time to Mineral Wells they installed it and took out the offending external wires.  All my protestations and requests to put the shorting wires thru the 26 pin ( I think it's 26) connector were ignored until Ed York said recently that because I'm "Experimental" thry probably could do that..  go figure.. 

  I've got another novel about the Absolute Alt Transducer that complicated this entire process.  Don Skeele   A&P N320J   235/320-------------- Original message from "Colyn Case at earthlink" <colyncase@earthlink.net>: --------------