Space invaders no thump - thump!

parabolic

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So im SOOO close on a fully working SI Deluxe. Im just missing the thump background sound. Using Brentradios "guide" on his page I swapped out the lm566 - no change. Can hear a faint hiss noise, but no thump. All other sounds are working just fine.
Any ideas??
 
so the test rom and ram mustve helped some!!

hell i didnt think about it but i have a JUNK sid boardset has corrosion etc but mabye some chips are salvagable?? if i wouldve known you had a sid i would have used a bigger box and sent the boards with...
 
Don't have the schematics handy, but I've found bad tant caps around teh sound circuits before.

I say Tant, but some boards use disc, or dipped. I use Tants they seem to work fine.
 
The chips involved with the "thump-thump" sound.....N5/P5/P4/K3-4.
The "thump-thump" sound mixes with the missile sound at P4...so if the missile sound is good...P4 is probably good. Same with K3-4....except it mixes with the explosion sound. I'd start at N5 and work out.

Edward
 
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