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Tube Amp Building - Tweaks - Repairs / Re: Why is this Princeton style amp not loud?
« Last post by sluckey on July 25, 2026, 09:07:56 am »The actual voltage on the grid is not that important. It's the voltage ***BETWEEN*** the grid and cathode that's important. Go read some Merlin pages.
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So what's the fix for his problem that you describe?The fix is to revert back to the original bootstrap bias circuit used in the original PR.

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