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Actually the JRC 4558DD Opamps are quite sought after for distortion pedals as they were the Ones used in the Original Ibanez "Tube Screamer" pedal which is a Pretty Kick ass pedal if you get the original model with the JRC 4558D opamp.....
Actually my really crappy Traynor guitar amp used a 4558 chip and it had a awefull sound which I was able to Improve considerably by replaceing it with a OPA2134 which might be a Good choice for your Mixer ...If you do go for the NE5532 (Which is a Pretty Good chip if used properly) you might try putting a 47pF ceramic cap between the Supply Pins which will help with stability with circuits not designed arround the NE5532......
Recapping the Electro"s might be a good idea if the Mixer is old , ecpecially if you Bypass them with some 0.1uf Poly"s, i don"t know about redoing the resistors as the Johnson noise from the Resistors is probably below the Noise floor of the of the Circuitry especially if it has a not well filtered and unregulated PSU , actually Increaseing the Value of the Filter caps in the Power supply with low leakage types and bypass them with some good Polly caps will probably have a Larger impact than many other Mods like the resistors......
I am actually contemplateing tearing open my Mixer which is a Really Crappy one (BST Labs36 8ch mixer) and seeing what Mods I can do on it as I have to open it up anyways because I believe a few Solder joints have come apart as I loose Ballanced operation on some Channels when I adjust the Gain knob......
Well good luck with your project.......
Cheers
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