[Eric]

I have a GE clock radio model 60 that was given to me   http://www.nostalgiaair.org/pagesbymodel...007714.pdf           17-16  Page 3 is the proper print.
the tubes all test good, and I recapped, checked the resistors and replaced one the voltages all come out ok. The radio plays good until I get these bursts of static which happens with the volume either up or down makes no difference. 

I can't seem to find the source I have done the following
replaced all the tubes one at a time
checked for loose connections cold solder joints
cleaned the tuner and checked the plates and it doesn't seem to make a difference as to position
wiggled and tapped everything I can get to.
Do I have a silver mica problem?
I haven't opened the IF's yet that is probably next! 
Any help would be appreciated

Eric