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Old 23rd August 2011, 10:03 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, 10:54 PM   #2
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I would put it in the preamp, on the inputs.
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
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Old 23rd August 2011, 11:50 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 24th August 2011, 12:02 AM   #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.

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Old 24th August 2011, 02:20 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, 02:42 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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