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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: It's not exactly the same.... posted by Dave Cigna on March 19, 2007 at 12:52:37:
You have it right. I do think it's a small thing. As implemented with a pentode, Va-k change is trivial. When it's done with a small resistor underneath( between ground and the cathode bias and bypass ), I think I can ignore the cathode's input Z. For a triode at the front of the amp, the FB signal might amount to a few % of Va-k. I agree with your assesment that this is also likely a trivial effect. It is a good thing to realize when you're 'neglecting air resistance', yes?
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- Re: It's not exactly the same.... - Try-ode 15:49:41 03/19/07 (0)
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