Weird Capacitors! Need help determining replacement value

[waspclothes]

Glad to know

It's news to me that opamps can become noisy like that. Intermittent crackly noise, but still functioning. Anyone know why that happens to them and what causes it?

[Enzo]

Semiconductors are way more likely to go noisy than caps or resistors.

If you are looking for a "cause", you likely will never find it. If you think it will be a "I did this, so that happened...", you will be disappointed. It rarely will be anything you "did". Playing real loud into it, or turning up your fuzz pedal will not affect the amp.

On the other hand, even when you cannot feel it, there is static electric charge on everything. it is possible at some point you plugged a guitar into the amp and a static discharge went through things and damaged a semi junction. Didn't kill it, just damaged it. Like stepping on a ladder rung and cracking it, but not all the way through. The six months later, it finally goes. Now you have no way to know what happened.

But within the IC, a defect or weak spot in the silicon could result in noise.

Failures elsewhere could afffect them. If for example you are running 15v rails, and a power supply fault puts 25v on the op amp, that can damage it. And again, it might not show up immediately.