These useful for anything?

[Username123]

I know that the 45580 number is one of the tube screamer ICs, but what are the values below that? Would they be useful for pedal building?

 

[benny_profane]

JRC is the manufacturer (the company is now called NJR). 4558 is the device. The ‘D’ at the end is the package (DIP 8 in this case). The other markings are manufacturing/lot numbers and can be ignored.

This chips would work fine in pedal circuits and are quite common dual op amps. You can buy current production NJR parts as well as the TI equivalent (RC4558).

 

[Username123]

Thank you. I was just curious because I recognized the IC name before.