05-10-2010, 08:01 AM
I've run into a couple 84's that hum when everything checks good and the problem turned out to be a bad ground on both of them.
If memory serves me correctly, there is a ground lug attached to the 42 tube through one of the tube socket's mounting rivets. The mechanical connection corrodes and you have hum.
Hope this helps
Ed
If memory serves me correctly, there is a ground lug attached to the 42 tube through one of the tube socket's mounting rivets. The mechanical connection corrodes and you have hum.
Hope this helps
Ed
