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Old 2nd July 2015
  #4
BC parts are noisy, their lowest noise NPN is the BC550. Toshiba 2SC3329BL are less noise = .7 nv/hz/sq.

Since the transistor pairs are not within the corrective feedback loop of the opamp, THD will be high. Placing them inside the feedback look al la 'trans-amp' would fix that.