Mutant Caterpillar Games | TerraCresta on a C128D (6581 SID) @mutantcaterpillargames6695 | Uploaded August 2015 | Updated October 2024, 2 hours ago.
A response to youtube.com/watch?v=J6OOk75XbMI - this is my personal C128D - which as far as I know has a good SID in it, but I've never done exhaustive tests. Hopefully it'll help in comparison to yours so you can see if yours is OK!
If you need a new SID chip, we have them (and other chips) in stock at the moment:
mutant-caterpillar.co.uk/shop/index.php?cPath=65_101