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RE: Now I am wondering if you know how our circuits actually work.

From what I have seen, the top portion of the circuit is not arranged as a CCS (I don't consider a cascode configuration to be related to a CCS since the load seen by the bottom triode is very low).

Such topology is reminiscent of Allen Wright's old circuit cookbook.

Still, you're going to get more self noise from the cascode differential pair than you would from a single cascode stage. This doesn't matter all that much in a linestage or power amp, but will start to bite you in a phono preamp.

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