In Reply to: The impedance is no problem posted by Ralph on June 17, 2014 at 08:13:55:
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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Follow Ups
- RE: The impedance is no problem - Lew 09:24:40 06/20/14 (7)
- In a pinch - Ralph 09:46:13 06/20/14 (6)
- So I'm guessing - Awe-d-o-file 17:36:36 06/26/14 (1)
- RE: So I'm guessing - Ralph 11:13:19 06/27/14 (0)
- Wow! - Lew 10:40:15 06/20/14 (3)
- RE: Wow! - Ralph 09:46:09 06/24/14 (2)
- As you know,.. - Lew 09:54:47 06/24/14 (1)
- RE: As you know,.. - Ralph 10:08:28 06/24/14 (0)