[Heathkit] Need Help SB401

[OTAKEBI@aol.com]

I am having a very interesting problem with my SB401.
At times I get no RF output in tune or SSB or CW.
If I pull up or push down near the SSB filter the RF output goes to normal.
However, the grid reading on the meter at full output goes up and down and 
does not hold steady.
If I push down in the same area I can get it to hold steady and stays in the 
normal range.
I have checked for bad connections under the rig and have added hardwire 
ground to the boards but no luck as to a fix.
Seems that the problem is worse when rig is cold and takes place less and 
less as rig warms up.
I know the relay is under the rig in this area.
Could it be relay related?
Could it be related to SSB filter ground?
It is in the same suspect area.
Pushing on the SSB filter seems to cause problem or fix it but why?
This problem is driving me nuts.
It is so intermittent that I can't track it down.
All help is appreciated.
Thanks,
Dan N4VET


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