Help Wiring a Replacement Potentiometer for Sonic T - Page 12

audio1st · 19th February 2007, 11:21 AM

Quote:

Originally posted by skibell
I pushed to hard and brought with me R80, which is in the new board R1, as I understand, now I should have no problem putting it back. But just by its side is a R1. Am I confused now???

You will need to replace R 80 ( previously R 1) otherwise you will only get sound from one channel..
New R 1 ( previously R 15 ) is the LED resistor..

Those boards can be a shock when you see them in the flesh after seeing the enlarged photos on your PC..

skibell · 22nd February 2007, 07:32 PM

Quote:

Originally posted by audio1st

You will need to replace R 80 ( previously R 1) otherwise you will only get sound from one channel..
New R 1 ( previously R 15 ) is the LED resistor..

Those boards can be a shock when you see them in the flesh after seeing the enlarged photos on your PC..

Got ya!

Makes sense, I appreciate your help.

ranger3 · 2nd March 2007, 09:27 PM

Has anyone combined the input wires of 2 t-amps to make a 4 channel t-amp in a single enclosure with 1 power supply?

Is their anything tricky about doing this or is it as simple as soddering both amps inputs to 1 set of RCA input jacks and doing the same for the 12v power?

Thanks,

Allen...

Buckapound · 2nd March 2007, 09:40 PM

This is no big deal to do. However, you may find with some sources, especially portable CD players, that the signal may be fairly weak, and you might not get the kind of volume the amps would be capable of with a stronger signal.

Driving from a preamp (or a battery-powered headphone amp) gives you plenty of signal for good performance.

--Buckapound

skibell · 5th March 2007, 03:35 PM

Quote:

Originally posted by audio1st

You will need to replace R 80 ( previously R 1) otherwise you will only get sound from one channel..
New R 1 ( previously R 15 ) is the LED resistor..

Those boards can be a shock when you see them in the flesh after seeing the enlarged photos on your PC..

OK, so I thought I had R 80 back on the board, but was not. Is there any other way to connect this R down the line, I mean a bigger R that I can solder? I bench tested the amp and I got sound (1 channel) with a CD and a 12V 2.5A PS.

Any help on how to re-connect R 80 somewhere down the line?

Maybe I should go back to tubes...

audio1st · 6th March 2007, 02:34 PM

Quote:

Originally posted by skibell

OK, so I thought I had R 80 back on the board, but was not. Is there any other way to connect this R down the line, I mean a bigger R that I can solder? I bench tested the amp and I got sound (1 channel) with a CD and a 12V 2.5A PS.

Any help on how to re-connect R 80 somewhere down the line?

Maybe I should go back to tubes...

You will need to connect a 20k resistor between one side of R4 and the C3 bridge..Please try not to lift R4 off the board..

skibell · 8th March 2007, 06:27 PM

Sorry, I am a point-to-point kind of guys and just follow visual instructions from manuals. I appreaciate the help got here. Cheers.

rallison · 10th April 2007, 05:46 PM

Folks, I recently reboxed my Sonic T-Amp per this helpful diagram:

http://www.diyaudio.com/forums/attac...amp=1097873773

During the initial check, double-check, and triple-check of my wiring effort I was so happy to have actual music coming out of both of the crappy little test speakers at my workbench that I did not notice what later turned out to be, when hooked to my usual pair, a massive channel imbalance (R>L). "Shucks" is a word vaguely related to the one that passed my lips.

If I crank the volume up to 85-95% of full, balance returns, but obviously with the Sonic T-Amp's distortion and my near-field listening set-up that's not the way to go.

Do I have a bad pot? I shudder to admit it, but my budget didn't allow for much and so it's an RS cheapo. Should I just re-solder? Replace with another/better? Or is it likely I have fouled up elsewhere...?

All patient replies deeply appreciated.

Lostcause · 10th April 2007, 08:17 PM

If you have a Multimeter then check both channels resistance at low levels. Put one probe on the input and the other on the output, measure, then do the same for the other channel... you will soon know if it is the pot or not.
I expect it is.

rallison · 10th April 2007, 10:28 PM

Thanks, I'll give that a shot. Should have occured to me of course, but but but... 'preciate your time.

2nd March 2007, 09:27 PM	#113
ranger3 diyAudio Member Join Date: Mar 2007	4 channels with 2 t-amps? Has anyone combined the input wires of 2 t-amps to make a 4 channel t-amp in a single enclosure with 1 power supply? Is their anything tricky about doing this or is it as simple as soddering both amps inputs to 1 set of RCA input jacks and doing the same for the 12v power? Thanks, Allen... __________________ Allen...

10th April 2007, 05:46 PM	#118
rallison diyAudio Member Join Date: Feb 2007 Location: Pgh., PA	Replace my Replacment Potentiometer? Or...? Folks, I recently reboxed my Sonic T-Amp per this helpful diagram: http://www.diyaudio.com/forums/attac...amp=1097873773 During the initial check, double-check, and triple-check of my wiring effort I was so happy to have actual music coming out of both of the crappy little test speakers at my workbench that I did not notice what later turned out to be, when hooked to my usual pair, a massive channel imbalance (R>L). "Shucks" is a word vaguely related to the one that passed my lips. If I crank the volume up to 85-95% of full, balance returns, but obviously with the Sonic T-Amp's distortion and my near-field listening set-up that's not the way to go. Do I have a bad pot? I shudder to admit it, but my budget didn't allow for much and so it's an RS cheapo. Should I just re-solder? Replace with another/better? Or is it likely I have fouled up elsewhere...? All patient replies deeply appreciated.

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2nd March 2007, 09:40 PM	#114
Buckapound diyAudio Member Join Date: Feb 2006 Location: Chicago, IL	This is no big deal to do. However, you may find with some sources, especially portable CD players, that the signal may be fairly weak, and you might not get the kind of volume the amps would be capable of with a stronger signal. Driving from a preamp (or a battery-powered headphone amp) gives you plenty of signal for good performance. --Buckapound

8th March 2007, 06:27 PM	#117
skibell diyAudio Member Join Date: Jun 2005 Location: Houston	Sorry, I am a point-to-point kind of guys and just follow visual instructions from manuals. I appreaciate the help got here. Cheers.

10th April 2007, 08:17 PM	#119
Lostcause diyAudio Member Join Date: Aug 2005 Location: NW UK	If you have a Multimeter then check both channels resistance at low levels. Put one probe on the input and the other on the output, measure, then do the same for the other channel... you will soon know if it is the pot or not. I expect it is.

10th April 2007, 10:28 PM	#120
rallison diyAudio Member Join Date: Feb 2007 Location: Pgh., PA	Thanks, I'll give that a shot. Should have occured to me of course, but but but... 'preciate your time.

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