Discussion
Why is a long-tailed pair so called?
Answer: C
The name comes from the large resistance, or in modern practice a current source, in the shared emitter tail, which is what forces the two devices to share a constant total current and so gives the stage its rejection. The collectors, the leads and the frequency response have nothing to do with it. A name describing the one component that makes an arrangement work is worth reading literally, since it points straight at the mechanism. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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