Quote from: Jazz P Bass on November 08, 2023, 01:57:15 AMI installed a modern version of the ic & the customer wanted to know what was wrong with the amp.
The distortion was NOT the same.
So, I grabbed the ic from the reverb circuit & swapped them around & wallah.
Interesting. So it's not simply a matter of using newer *types*, like 4332 or TL072, but 4558 of more recent manufacture..
So did the manufacturer(s) update the datasheets to reflect the improved specifications, or did they leave them alone, figuring that as long as the new parts "meet or exceed" published values, they were ok?
Either way, kind of an annoying situation. Do you know, roughly, when the new-spec 4558 devices began appearing?