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Other new superior replacements include the new BurrBrown OPA2211A, a 1.1 nv noise opamp with 150 uv offset voltage. Also try the Analog Devices ADA4075-2, a low power (same as the TL072 at 1.8 ma per amp) 12 v slew rate, low 2.8 nv noise.
Jim Williams
Audio Upgrades
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