Mac SE/30 making zipping and buzzing noises

[dave at 661.org]

I'm gradually restoring a Mac SE/30.  Today I got a new PRAM battery and 
installed it.  There was no battery leakage, so I'm good there.  The 
machine seems to run just fine.  The big problem now is that even though 
nothing should be emitted from the speaker, I'm getting zips, buzzes, and 
burbles from it depending on what the computer is doing at the time.  I'm 
quite sure the the sound circuitry is somehow picking up RF noise from the 
system bus.  What does this symptom indicate?  Should I recap the whole 
machine?

-- 
David Griffith
dave at 661.org

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