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NAP-140 Clone Amp Kit on Ebay
NAP-140 Clone Amp Kit on Ebay
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Old Yesterday, 11:30 AM   #3091
johnego is offline johnego  Indonesia
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Join Date: Dec 2017
Quote:
Originally Posted by pattox View Post
I built an NCC200 quite a few years ago and am very happy with it. I'm now curious to know what its phase margin is given that it was loosely based on the NAP250 which apparently had marginal stability.

I plan to run some simulations to explore the phase margin of the NCC , and perhaps the NAP250 as well.
I couldn't find the original Naim schematic in my LTspice projects but my Naim clone shows gm/pm of 19/83. So nothing wrong with phase margin but gain margin is slightly below my minimum standard which is 20dB. This proves that you are right with the tendency for instability because with other topology i have never get that low with gm.
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