AG 440 output distortion due to VU meter

The output distortion is improved by dropping the closed-loop gain by 10 dB, thereby lowering the output source impedance. The feedback shunt resistor is raised from 510 ohms to 1500 ohms, and 470 uF capacitor was added across the 390 ohm resistor. (I believe the AG440C has this gain reduction on its repro cards.)
One should use an amplitude sweep as shown here to evaluate a VU meter’s effect.

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