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Old 23rd August 2011, 09:03 PM   #1
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Default volume pot question, help.

Hi everyone, I'm Bruno from Uruguay, I'm very new about this audiophile world, even more on the DIY.

I have just brought an tube pre-amp kit from analogmetric, as an audio POT, im going to start building soon, im going to pair this preamp with 2xPA150 (3xLM3886 each) but I dont know where to put the volume pot, if in the preamp or in the poweramp.

So guys what do you say?


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Old 23rd August 2011, 09:54 PM   #2
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I would put it in the preamp, on the inputs.
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Old 23rd August 2011, 10:50 PM   #3
tinitus is offline tinitus  Europe
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what is input impedance of your power amp ?

and what is gain/output of your preamp ?

how much voltage out from your source ?
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Old 23rd August 2011, 11:02 PM   #4
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Many amps have down sloping distortion (less distortion at higher gain). In such a case, it is better to have the pot at the end of the preamp. It will also be better from a noise point of view. You need to match the input level, however, so that the preamp will be operating in its optimum region on the input signal you will provide.

An FFT of my life would show a couple of peaks and some low level harmonics, but mainly random noise.
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Old 24th August 2011, 01:20 AM   #5
tinitus is offline tinitus  Europe
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hey, it appeared tricky to find your thread when not on front page
so I moved you to tube amp forum
hope its ok

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Old 24th August 2011, 01:42 PM   #6
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with a low e nought value pot noise shouldnt be too much of a problem, either that or is it possible to put the volume pot after the first gain stage?
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