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Old 12th February 2003
Smart Research

Yes, worry first about any chip connected to the patch or outputs. The circuits tell you everything else.......and a good scope.....and ideally an AP.....

I hadnt come across the OPA134, thanks !. Looking at the datasheet, being a fet opamp it looks definately like a good upgrade for TLOXX. Though, comparing with a 5534 the output drive is not as good, and noise will be worse in low impedance (<10k) input circuitry. You'd get better chip distortion, and double the slew rate though.