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RE: The impedance is no problem

Based on Kevin Covi's (and John Broskie's) formula, Zo = rp/mu+2, where rp is defined as the parallel sum of the plate resistances per phase, I calculated the output impedance of my MP1 at about ~170 ohms, give or take. That's plenty low for a tube preamp, low enough to drive any solid state amplifier, and I guess that the low power requirement of 32-ohm headphones makes it possible for the preamp to drive such, even though the impedance match would not be ideal.


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