I have a Fender London Reverb amplifier from 1984 that uses the old TI TL60x P-MOS analog switch chips in the audio path. The channel 1/2 switch and reverb on/off both have become intermittent and both functions use the analog switches. Is this a known failure mode for these chips, or is it when they die they just die?
Thanks,
George
Thanks,
George
There is no this-is-how-they-fail list. Any chip can just stop working, or it can be intermittent, or it can get noisy, or a host of other things.
They are intermittent, so make sure the IC is really at fault. Monitor the control pins. Is the control signal steady? or does it hop around? For that matter is the power supply for these steady and clean?
Do the panel lights intermitt as well or are they steady and ONLY the audio is affected?
I don't know about the TL607, only place I remember seeing one is here. But the TL604 was used by many, and in fact Peavey made a workaround. CALL their parts department if you want one. They made a small board with 8 long legs to solder in place of the original IC. The board has a couple ICs and a resistor or two. Last I heard, $20, and worth it.
They are intermittent, so make sure the IC is really at fault. Monitor the control pins. Is the control signal steady? or does it hop around? For that matter is the power supply for these steady and clean?
Do the panel lights intermitt as well or are they steady and ONLY the audio is affected?
I don't know about the TL607, only place I remember seeing one is here. But the TL604 was used by many, and in fact Peavey made a workaround. CALL their parts department if you want one. They made a small board with 8 long legs to solder in place of the original IC. The board has a couple ICs and a resistor or two. Last I heard, $20, and worth it.