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And, from the datasheet on Kubarth's website, I think I've answered my own questions (assuming the garOA10 is the same as the Neumann in these respects):

  • Differential input impedance = 40k...
  • So on a mic impedance of 200R, around a 4.5:1 step up on the input transformer seems about as much as I can ask for...
  • And given output impedance and current, 50dB into a 150:600 OPT should be very doable.


There's a few ill-informed assumptions going on here (eg that input Z is more a function of topology than the exact transistors used), so I'd be grateful for a steer if I'm wildly off base with any of this. Otherwise: test and learn!  ;)


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