volume pot question, help.

trmntr · 23rd August 2011, 09:03 PM

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?

Greetings,

Bruno

mikje · 23rd August 2011, 09:54 PM

I would put it in the preamp, on the inputs.
Mike

tinitus · 23rd August 2011, 10:50 PM

what is input impedance of your power amp ?

and what is gain/output of your preamp ?

how much voltage out from your source ?

vacuphile · 23rd August 2011, 11:02 PM

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.

vac

tinitus · 24th August 2011, 01:20 AM

hey, it appeared tricky to find your thread when not on front page
so I moved you to tube amp forum
hope its ok

moderation

razorrick1293 · 24th August 2011, 01:42 PM

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?

23rd August 2011, 09:03 PM	#1
trmntr diyAudio Member Join Date: Aug 2011	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? Greetings, Bruno

23rd August 2011, 09:54 PM	#2
mikje Soakin' up the Sound! diyAudio Member Join Date: Feb 2008 Location: Bismarck, ND	I would put it in the preamp, on the inputs. Mike __________________ Marantz PM8003 amp, Squeezebox Touch, DIY Krystals

23rd August 2011, 11:02 PM	#4
vacuphile diyAudio Member Join Date: Apr 2011 Location: Seaside	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. vac __________________ If my 15 V DC were the radius of the Earth, Mount Everest would be 1 meter tall.

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23rd August 2011, 10:50 PM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	what is input impedance of your power amp ? and what is gain/output of your preamp ? how much voltage out from your source ?

24th August 2011, 01:20 AM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	hey, it appeared tricky to find your thread when not on front page so I moved you to tube amp forum hope its ok moderation

24th August 2011, 01:42 PM	#6
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	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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