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In Reply to: Re: What does it do? + $0.02 posted by Ian L on April 29, 2007 at 11:13:20:
>...ideally, the diode limits the screen's AC interaction with the plate, so the output doesn't contain AC signal from screen involvement...I don't see how it can do that. Assuming the screen is always drawing current, the diode will be continuously conducting, with only a 0.7V drop to show for its presence. Regardless of whether we perceive the circuit to be one where the screen modulates the plate, or one where the plate modulates the screen, they are connected together by the diode just as firmly as if it were a small value resistor dropping 0.7V. Only if the plate were to become negative relative to the screen could the diode do anything else. If there really is an audible difference with the diode in place, I intuitively suspect something bad is happening. Have you ever looked at the voltage across the diode with a scope, just to see if it does in fact ever turn off?
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Follow Ups
- Re: What does it do? + $0.02 - Triode_Kingdom 14:48:28 04/29/07 (3)
- Re: What does it do? + $0.02 - Ian L 18:06:01 04/29/07 (2)
- Re: What does it do? + $0.02 - Triode_Kingdom 19:49:46 04/29/07 (1)
- Whatever it's effect ... - Naz 22:13:27 04/29/07 (0)
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