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So I'm chasing down some sound issues in my Taito 3 board Space Invaders.

I thought I had it fixed but everything got faint and poppy again.

After looking at the schematic and reading a few threads I'm going after the 3900's. There are 7 according to the print.


But 4 of them on my board are RC3401's?
So now I'm bewildered as they don't appear to be a direct replacement.

Any input is appreciated.
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