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Old 5th July 2015
  #8
It's a 1970's instrumentation amp mic preamp, sort of like the Brits used to do before they all discovered Paul Buff's work. Matched devices would improve CMRR and might allow the direct coupling of the gain set pot, but other problems like high THD and noise will still overwelm that.

It's best left alone and better candidates found for real world improvements.