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Tube Amp Building - Tweaks - Repairs / Re: Why is this Princeton style amp not loud?
« Last post by Sonny ReVerb on July 27, 2026, 01:40:10 pm »Well, I dug into the amp today. I had already removed that fixed bias circuit for the PI, so that wasn't the problem. I retraced the circuit. I didn't find any wiring problems or incorrect components. I used a 100 ohm tail resistor and a 3300 ohm NFB resistor from the 4 ohm speaker tap for the NFB circuit. I tried disconnecting that. No significant change. I'm not sure there's a real problem, because everything works. It just doesn't seem as loud as it should be. I ordered some CTS "J taper" 1 meg pots. I'm going to replace the Alpha volume pots. Maybe that will make me happy...?

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