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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: RE: Audio on the bias posted by Michael Samra on April 25, 2015 at 09:49:12:
"it makes you wonder how much of the audio signal may getting filtered out by that cap when it's good."
In terms of grid signal, I don't see the difference between grounding a tiny portion through the C- rail filter, or connecting the grid resistor directly to ground. In any event, it's the C- filter that the grid resistor sees, not the rectifier ahead of it. Maybe you're hearing a reduction in IM due to more effective filtering at 120 Hz. Even with a half-wave rectifier though, ripple should be really tiny. Difficult to imagine how it could produce audible levels of IM unless the filter is defective...
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Follow Ups
- RE: Audio on the bias - Triode_Kingdom 11:39:53 04/25/15 (1)
- RE: Audio on the bias - Michael Samra 19:23:21 04/25/15 (0)
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