411A, yes afraid you are right, mate. The intricacies of early pure-jet 707s are a little before my time. Are you suggesting that some early 707s had yaw dampers in parallel with the rudder pedals such that the rudder pedals moved with the yaw damper?
And, mustafagander, can you enlighten us as to why it is that the Saab 340 yaw damper must be off for take-off? Is it because the yaw damper provides inputs to a rudder artificial feel unit or for some other reason?