Autopilot Servo

[GMAs]

Been reading the mail... and it seems you all are looking in the right place... replacing all the transistors is not a good thing to do... as the new ones are not the same as the old ones... they have more gain and a different set voltage... 0.7 while the others are 0.3... so you will lose some of the sense on the operation...

But,....

More its the pot in the servo that gives you the feed back... and they are AB pots that can be gotten from Newark Electronics... they are a carbon type... and were never designed to be used like the ones are... and yes the carbon wears thin by the movement of the controls... weather its on or off... to the point where it is no more... and you get the symptoms of it commanding one way or the other... another problem is that it gets oil on it... and that will give you the same problem... WD-40 and some of the other lubes are penatrants... and they make their way into everything... and in this case will mess up the electronics..

Hope this helps... you guys are doing a good job of going thru the operation and parts of the thing... GMAs