Sonic Impact T amp remove/bypass the volume control/pot - diyAudio
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Old 19th April 2007, 10:06 AM   #1
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Cool 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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Old 19th April 2007, 10:14 AM   #2
Puffin is offline Puffin  United Kingdom
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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.
Attached Files
File Type: pdf scan pot.pdf (57.6 KB, 254 views)
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Old 19th April 2007, 03:51 PM   #3
kec is offline kec  United States
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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
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Old 19th April 2007, 04:23 PM   #4
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are resistors really necessary? i am using mine without resistors.
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Old 20th April 2007, 07:15 AM   #5
Puffin is offline Puffin  United Kingdom
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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 !
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Old 20th April 2007, 09:52 AM   #6
Fin is offline Fin
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Hey!......Now it has magically turned the right way up!!!
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File Type: pdf no pot.pdf (59.8 KB, 226 views)
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Old 20th April 2007, 01:57 PM   #7
kec is offline kec  United States
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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
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Old 21st April 2007, 12:18 AM   #8
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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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