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We often replace them with a jumper wire. For example in some of their amps, a TL604 sits at the output of the reverb recovery. COntrolling it turns the reverb on and off. If the 604 dies, we can pull it and stick a jumper wire between the in and out pins and the reverb will just always be on, like many amps.
Or in some amps we might have a 604 that switches between two things and so can't be wired. SO we steal the good one from the reverb for that and wire the reverb across.
Also be aware there are paths through it, and in one circuit it might come in one end and out the other, while on a different circuit it comes in the far end and out back here. SO look at the individual circuit you find one in and see which path through it is being invoked. If you think the 604 is blocking the signal, then you could replace the 604 with a jumper just to see that the rest of the signal path is working, even if that means you can't switch somethinig while doing that.
SO yes, it doesn't amplify, it is just a switch.
Actually it is two switches - two paths through the IC. One is closed or the other.
Or in some amps we might have a 604 that switches between two things and so can't be wired. SO we steal the good one from the reverb for that and wire the reverb across.
Also be aware there are paths through it, and in one circuit it might come in one end and out the other, while on a different circuit it comes in the far end and out back here. SO look at the individual circuit you find one in and see which path through it is being invoked. If you think the 604 is blocking the signal, then you could replace the 604 with a jumper just to see that the rest of the signal path is working, even if that means you can't switch somethinig while doing that.
SO yes, it doesn't amplify, it is just a switch.
Actually it is two switches - two paths through the IC. One is closed or the other.
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