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Old 27th April 2013, 03:48 AM   #1
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Default Reducing Signal Level Without Affecting Tone

Subject basically sums it up...is there any way I can reduce the signal in the preamp without compromising the tone? The 2 general ways I know how are lowering the resistor to ground (which reduces bass) or increasing the resistor in the signal path (which cuts off treble)...hoping there is another way that I'm just not aware of. Thanks for the help.
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Old 27th April 2013, 04:07 AM   #2
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Do you have a schematic of the preamp?

One easy way is adding a resistor in series with the input to your volume pot, and it won't affect the tone.

Increasing the resistor in the signal path won't decrease treble. Decreasing a resistor, say a control grid leak resistor after a capacitor will decrease the bass.
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Old 27th April 2013, 06:05 AM   #3
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Removing the cap on the cathode might do it. (The one(s) paralleling Rk).
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Old 27th April 2013, 06:51 AM   #4
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Maybe I don't get it, but what's wrong with a volume control?
Or are you looking at some form of control that follows the Fletcher-Munson curves?

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Old 27th April 2013, 03:09 PM   #5
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Ahh, thanks for the responses. I do have a volume control but I'd like the signal to be reduced even more...I think the resistor before volume control sounds good because then there won't be a low pass filter. I will give it a shot.
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Old 27th April 2013, 04:57 PM   #6
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Quote:
Originally Posted by SemperFi View Post
Removing the cap on the cathode might do it. (The one(s) paralleling Rk).
Removing the cathode bypass cap, if you have one, will decrease gain by about 1/3 to 1/2 AND decrease distortion. That's a good thing.

If you add a 100K resistor in series with the input of the volume pot, and your
volume pot is 100K, you'll cut your signal in half.

If your preamp or amp is tubed, there are several other things you can do to lower gain and distortion.
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