Those are the modifications I've made so far to my DBX 166:
PSU MoD: - Replace c3 ,c4, c7, and c8 with 1000uf-2200uf 35v caps
- Replace c5 and c9 with a .1uf film cap (preferably polypropelene)
- Bypass c6 and c10 with .1uf film caps
Channel 1:
IC MoD: - Replace chip OA1 with better ic (NE5532,)
- Repalce chip OA2 with better ic ( OPA134)
- Replace the VCA IC1 with a THAT 2180AL08-U (lift pin 4, pin 4 should not connect to anything)
- Add a 47pf NPO ceramic cap from pin 3 of OA2 to ground (Suggested by Jim Williams)
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