{Collins} 516F2 Problems

Hello All

Thought I would mention a problem I had yesterday. After putting the 516F
back in its cabinet, I found the KWM2 dead, on both receive and transmit.
Found four valves that did not appear to have their heaters on, both 6AZ8's
and two 6U8's ( V1, 3, 13 and 17 )  while all the other valves glowed


Solution was one of the earth connections on the power supply cable. Collins
soldered the braid at the chassis end of the cable, to a rather thin solid
wire which then goes to the ground point on a terminal strip. If the strain
relief clamp is not tight, and allows the cable to flex a bit, the
connection at the braid of the cable breaks easily, and allows the earth
connection to open. Specifically, it is pin 3 of the cable which is open,
rather than earthed.


Hope this helps someone find and solve their problems quickly. 








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