Noise om my modified SI T-amp

Plydsen · 1st September 2005, 07:11 AM

Hi Audioguys!

I've just completed modifying my new SI T-amp - adding premium terminals and RCA's and connected it to my Elna/MiniMelf attenuator. I changed from batteries to a 12V/2Amp PSU. I followed pretty much the mods sugested by David Holgate of TNT (www.tnt-audio.com).
The amp is working "fine" but it is incredible noisy. I should say that 1/3 of the signal is pure and steady "white" noise, and it is present whether I have my audiosource running or not.

Can anyone help my out on this one?

Best regards,

Plydsen

Mick_F · 1st September 2005, 09:01 AM

This is definitely not normal. Did you have such a high noise level also before you modded the amp?

Mick

BWRX · 1st September 2005, 11:42 AM

can you try hooking up a different source? if so, see if the noise is still present.

Plydsen · 1st September 2005, 12:09 PM

Hej Mick

Unfortunately I didn't try the amp before the mods. I guess I was to eager getting the magic... Quite a mistake.

Plydsen

audio1st · 2nd September 2005, 01:04 PM

Have you tried it with a different power supply, say a 12v car battery?

Plydsen · 5th September 2005, 12:21 PM

BWRX and Barry -

Unfortunately... Noise on all sources - also using a 12V batterypac

I've ran through another check without finding any anomalities - may I conclude that this little thing let me down in the first place?

Plydsen

Mick_F · 5th September 2005, 12:58 PM

Quote:

may I conclude that this little thing let me down in the first place?

That would not be too surprising. When I first bought the SI I ordered two and only one worked.

Mick

BWRX · 5th September 2005, 05:59 PM

I have an AMP3 and also had some noise problems - a white noise type sound similar to what you described. Jan pointed out that the noise may be due to a bad solder joint at the biascap pin on the chip or around one of the 0.1uF decoupling caps. The biascap pin on the TA2024 is pin 16. Pin 1 is the pin closest to the triangular corner on the chip and pin 16 is the third pin up from that side of the chip. Check that joint and go over it with your soldering iron and any other solder joints that may look really dull or lumpy. My AMP3's noise was greatly reduced when I resoldered the biascap pin and redid some of the 0.1uF joints.

Plydsen · 5th September 2005, 08:18 PM

Mick and BWRX and Barry!

Thanks for your various contributions...

I ran carefully over the joints with my solderion with no improvements whatsoever....

So I must admit that I just ordered an Amp6 by 41hz.com and committed the SI to the dustbin... still, the Class-D is a fun and affordable hobby.

Thanks for you time and efford,

Plydsen

BWRX · 5th September 2005, 11:51 PM

Sorry to hear you couldn't get the amp working.

Quote:

Originally posted by Plydsen
So I must admit that I just ordered an Amp6 by 41hz.com and committed the SI to the dustbin... still, the Class-D is a fun and affordable hobby.

Good to hear that it didn't discourage you from joining the tripath party

If the AMP6 sounds anything like the AMP3 you made a wise purchase!

1st September 2005, 07:11 AM	#1
Plydsen diyAudio Member Join Date: Oct 2003 Location: Aarhus, Denmark	Noise om my modified SI T-amp Hi Audioguys! I've just completed modifying my new SI T-amp - adding premium terminals and RCA's and connected it to my Elna/MiniMelf attenuator. I changed from batteries to a 12V/2Amp PSU. I followed pretty much the mods sugested by David Holgate of TNT (www.tnt-audio.com). The amp is working "fine" but it is incredible noisy. I should say that 1/3 of the signal is pure and steady "white" noise, and it is present whether I have my audiosource running or not. Can anyone help my out on this one? Best regards, Plydsen

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1st September 2005, 09:01 AM	#2
Mick_F diyAudio Member Join Date: Jun 2005 Location: Cologne	This is definitely not normal. Did you have such a high noise level also before you modded the amp? Mick

1st September 2005, 11:42 AM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	can you try hooking up a different source? if so, see if the noise is still present.

1st September 2005, 12:09 PM	#4
Plydsen diyAudio Member Join Date: Oct 2003 Location: Aarhus, Denmark	Hej Mick Unfortunately I didn't try the amp before the mods. I guess I was to eager getting the magic... Quite a mistake. Plydsen

2nd September 2005, 01:04 PM	#5
audio1st diyAudio Member Join Date: May 2005 Location: Foxton, CAMBS..	Have you tried it with a different power supply, say a 12v car battery?

5th September 2005, 12:21 PM	#6
Plydsen diyAudio Member Join Date: Oct 2003 Location: Aarhus, Denmark	BWRX and Barry - Unfortunately... Noise on all sources - also using a 12V batterypac I've ran through another check without finding any anomalities - may I conclude that this little thing let me down in the first place? Plydsen

5th September 2005, 05:59 PM	#8
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	I have an AMP3 and also had some noise problems - a white noise type sound similar to what you described. Jan pointed out that the noise may be due to a bad solder joint at the biascap pin on the chip or around one of the 0.1uF decoupling caps. The biascap pin on the TA2024 is pin 16. Pin 1 is the pin closest to the triangular corner on the chip and pin 16 is the third pin up from that side of the chip. Check that joint and go over it with your soldering iron and any other solder joints that may look really dull or lumpy. My AMP3's noise was greatly reduced when I resoldered the biascap pin and redid some of the 0.1uF joints.

5th September 2005, 08:18 PM	#9
Plydsen diyAudio Member Join Date: Oct 2003 Location: Aarhus, Denmark	Mick and BWRX and Barry! Thanks for your various contributions... I ran carefully over the joints with my solderion with no improvements whatsoever.... So I must admit that I just ordered an Amp6 by 41hz.com and committed the SI to the dustbin... still, the Class-D is a fun and affordable hobby. Thanks for you time and efford, Plydsen

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