Killed my T-Amp?

JWFokker · 26th March 2007, 10:08 PM

I got a new SI T-Amp after my first one died mysteriously, and now my second one isn't working either. The only modification I did to it was to wire it to my 12V power supply and now when I turn it on, the LED lights up, but no sound comes out. When I hook it up to my TCC preamp/switch box, if I turn the T-Amp on, the LED on the TCC channel indicator (Phono/Aux1/Aux2/Aux3) goes out regardless of what channel I have selected. Is the T-Amp dead or is something just not hooked up correctly?

BWRX · 26th March 2007, 10:18 PM

Is your 12V power supply actually 12VDC? Do you have a multimeter or oscilloscope you can use to probe around the circuit? Specifically, measure each output with respect to power supply ground. Each output should be floating around 6VDC. Also, look for 2.5V on the chip side of the inputs.

JWFokker · 28th March 2007, 12:34 AM

Inexplicably, at least to me, if I use a separate DC power supply for the T-Amp, everything now works. This is confusing though, because I had always used the single power supply previously.

poynton · 28th March 2007, 06:54 AM

Strange !

Could be a ground problem ?

26th March 2007, 10:08 PM	#1
JWFokker diyAudio Member Join Date: Feb 2005 Location: Kingston, NY	Killed my T-Amp? I got a new SI T-Amp after my first one died mysteriously, and now my second one isn't working either. The only modification I did to it was to wire it to my 12V power supply and now when I turn it on, the LED lights up, but no sound comes out. When I hook it up to my TCC preamp/switch box, if I turn the T-Amp on, the LED on the TCC channel indicator (Phono/Aux1/Aux2/Aux3) goes out regardless of what channel I have selected. Is the T-Amp dead or is something just not hooked up correctly?

26th March 2007, 10:18 PM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Is your 12V power supply actually 12VDC? Do you have a multimeter or oscilloscope you can use to probe around the circuit? Specifically, measure each output with respect to power supply ground. Each output should be floating around 6VDC. Also, look for 2.5V on the chip side of the inputs. __________________ Brian

28th March 2007, 06:54 AM	#4
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Strange ! Could be a ground problem ? __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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28th March 2007, 12:34 AM	#3
JWFokker diyAudio Member Join Date: Feb 2005 Location: Kingston, NY	Inexplicably, at least to me, if I use a separate DC power supply for the T-Amp, everything now works. This is confusing though, because I had always used the single power supply previously.

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