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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: NFB - when it's good, it's good, when it's bad, it's bad posted by kurt s on January 18, 2007 at 20:13:43:
My modeling experiments with LTSpice tend to show that you're right. Stick 26dB or more of global NFB on a pentode PP circuit that already performs well open loop, and you get vanishingly small levels of distortion. With triodes, the improvement just isn't there and you're better off using high sensitivity speakers that will respond well to no NFB.I know Spice is not the real thing, but some experienced users of Spice, who've persevered with it and whose views I respect, reckon that it does a really good job. I've been able to try far more topologies and different tube types with Spice modeling than I ever could try (or afford) in the real world.
YMMV
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- Interesting! - Ray Moth 22:44:28 01/18/07 (0)
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