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But Philip would be dismayed to know that Forssell's opamps have only about 20-40 dB of open loop gain and under full negative feedback still exhibit meaningful amounts of harmonic distortion compared to a 5534
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Actually Bob that is only true for my older vacuum tube opamps which have distortion in the 0.006% range. My JFET-993 opamps (which I've been using for about 5 years now) have 75- 80 dB open loop gain and THD+N figures in the 0.0002% range.