AMS DMX 1280 delay repair - logic chip question

[leadpoisoning]

When replacing TTL circuitry, note that AMS were quite notorious for designing "to the edge" when it comes to dependence on gate propagation delays. This especially in their StudioComputer and AudioFile, but to some degree also across their entire works.

I have had several issues where replacing a dead 74xx package didn't help at all, until I dropped in one from a batch close to the original (!!).

Do NOT expect just any chip family to work, even if "100% compatible" in theory

Jakob E.

well that's quite interesting Jakob ...thanks and very good to know! I was thinking of ordering some 'new' 74xx chips for the D/A boards 'just because' but maybe i'll wait to see if there are any problems passing audio when i fire it up.