FAULTS 



rise time at the output for a step-function at the input was found to be a few 

 orders too long. Attention was at once directed to the ampHfiers, but no 

 explanation could be found. At length, someone spotted a drawer under 

 the bench and below the hole, and inside lay a brand-new 100 yard coil of 

 cable. One end went up through the hole to the pre-amplifier, the other over 

 the back of the drawer to the main amplifier. The technician had not liked 

 to cut it ! 



670 



