[Premium-Rx] Racal RA6790GM

[John]

Greetings group
We have subj rec and enjoy it very much so plan to get another 
(Frankenstein unit made from parts). 
Question is:
In looking inside the rec and with the gain turned up, I hear some noise 
that sounds like computer clock harmonics.  The rec has the A6 computer 
interface boards and the noise I hear gets noticeably louder when I put 
my finger on the memory chip packages and some of the other LSI packages 
on the A6 boards.  Is this normal or do we have a problem???

regards
John