Sonic Impact T amp remove/bypass the volume control/pot

yama1000m · 19th April 2007, 10:06 AM

I've just got hold of a Sonic Impact T amp and would like to know the best way to bypass/remove the volume control/pot completely. I want to control the volume by using my stepped potentiometer passive pre amp.
Basically, modify the T amp to be used as power amp.
Do I just remove the T amp 50k pot and replace it with some 50k resistors?
I don't want to start doing all the recommended input cap mods & etc yet as I want to live with original T amp sound first without it's volume control.
I know the easiest way is just to turn the T amp volume to max but and I want to achieve the cleanest, purest sound when using my passive pre amp.

Puffin · 19th April 2007, 10:14 AM

Some time ago I produced a wiring diagram for this mod. However when I tried to attach it, I failed. I'll see if it works this time.

kec · 19th April 2007, 03:51 PM

Quote:

Originally posted by Puffin
Some time ago I produced a wiring diagram for this mod. However when I tried to attach it, I failed. I'll see if it works this time.

It's upside down

MisterTwister · 19th April 2007, 04:23 PM

are resistors really necessary? i am using mine without resistors.

Puffin · 20th April 2007, 07:15 AM

If you print the diagram off and use the devices attached to the ends of your arms, you can magically turn it the right way up.

I tried to turn it around, but I only have a free version of Adobe !

Fin · 20th April 2007, 09:52 AM

Hey!......Now it has magically turned the right way up!!!

kec · 20th April 2007, 01:57 PM

Quote:

Originally posted by Puffin
If you print the diagram off and use the devices attached to the ends of your arms, you can magically turn it the right way up.

I tried to turn it around, but I only have a free version of Adobe !

I was only teasing

yama1000m · 21st April 2007, 12:18 AM

Thanks for the diagram on how to modify t- amp into a power amp. After listening to my new SI t-amp using a 12 volt 5 amp switch mode mains power supply for over a week, I prefer it over my £1000 Unison Research Simply 2 single ended tube integrated amp! This £30 plastic toy amp is outstanding value for money.

19th April 2007, 10:06 AM	#1
yama1000m diyAudio Member Join Date: Apr 2007	Sonic Impact T amp remove/bypass the volume control/pot I've just got hold of a Sonic Impact T amp and would like to know the best way to bypass/remove the volume control/pot completely. I want to control the volume by using my stepped potentiometer passive pre amp. Basically, modify the T amp to be used as power amp. Do I just remove the T amp 50k pot and replace it with some 50k resistors? I don't want to start doing all the recommended input cap mods & etc yet as I want to live with original T amp sound first without it's volume control. I know the easiest way is just to turn the T amp volume to max but and I want to achieve the cleanest, purest sound when using my passive pre amp.

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19th April 2007, 04:23 PM	#4
MisterTwister diyAudio Member Join Date: Feb 2006 Location: usa Blog Entries: 1	are resistors really necessary? i am using mine without resistors.

20th April 2007, 07:15 AM	#5
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	If you print the diagram off and use the devices attached to the ends of your arms, you can magically turn it the right way up. I tried to turn it around, but I only have a free version of Adobe !

21st April 2007, 12:18 AM	#8
yama1000m diyAudio Member Join Date: Apr 2007	Thanks for the diagram on how to modify t- amp into a power amp. After listening to my new SI t-amp using a 12 volt 5 amp switch mode mains power supply for over a week, I prefer it over my £1000 Unison Research Simply 2 single ended tube integrated amp! This £30 plastic toy amp is outstanding value for money.

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