Discussion
Which input stage suits a low-impedance source such as a moving-coil cartridge?
Answer: A
A low source resistance generates little thermal noise of its own, so what matters is the amplifier's input noise voltage, and a bipolar pair run at a good current has the lowest available. Field effect devices excel with high-impedance sources where their negligible input current dominates, and degeneration raises the noise voltage. Which family is quieter depends entirely on the source impedance, which is why low-noise design begins by measuring the source rather than by choosing a device.
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