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amplifier input impedance

Posted by Lew on June 22, 2017 at 15:04:19:
Wouldn't it be more correct to say that most amplifiers have an input impedance ranging from 10K to 100K ohms, with solid-state amplifiers clustered at the bottom of that range and tube amplifiers up around 50K and above? "47K" is the standard load resistance for an MM phono stage, as I am sure you know.