Dc offset on usamps axtu 1000 - diyAudio
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Old 25th August 2009, 01:34 PM   #1
tomat is offline tomat  Indonesia
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Default Dc offset on usamps axtu 1000

i have a problem with this hybrid amp, i measure 1 volt dc output on right channel speaker output,what can cause this?

thanks
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Old 26th August 2009, 12:05 AM   #2
tomat is offline tomat  Indonesia
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Anybody can help? Thanks
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Old 26th August 2009, 12:17 AM   #3
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I didn't reply because I know nothing about the amp.

Does it produce clean audio on the channel with DC offset?
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Old 26th August 2009, 05:40 AM   #4
tomat is offline tomat  Indonesia
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thank you,i'm not try to connect to the loudspeaker yet,i'm just measure at the speaker output terminal
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Old 26th August 2009, 07:29 AM   #5
amc32 is offline amc32  United States
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Don't use a speaker as of yet,grab an O'scope and view the signal with no load and/or speaker.
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Old 26th August 2009, 02:03 PM   #6
tomat is offline tomat  Indonesia
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thank you,i feel strange with the relay,it works too soon,after i turned on the amp,only 2 or 3 seconds the relay starts to work,it placed after the capacitor from the tubes to transistor circuit (amplifier circuit)
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File Type: jpg axtu1000.3.jpg (224.1 KB, 68 views)
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Old 26th August 2009, 03:33 PM   #7
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Do you have DC offset before the relay clicks?
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Old 27th August 2009, 02:43 AM   #8
tomat is offline tomat  Indonesia
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yes,about 150mv,and then +/- 1 volt after the relay clicks.
thanks a lot
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Old 27th August 2009, 02:55 AM   #9
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Unless someone has some hands on experience with this amp (or something similar), I think you'll have to compare one channel to the other to see where the DC is being introduced into the circuit.
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Old 22nd February 2011, 11:14 PM   #10
finbar is offline finbar  Canada
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I know this is an old thread but I have just gone through adjusting the DC offset on a USAMPS AX TU1000C.
Greg at U.S. Amps got me squared away, he was very approachable and helpful.
A multi-meter, screwdriver and allen-wrench did the job.
I powered up the amp with no input or load and let it sit for 20 minutes.
I adjusted the pots (small increments) while monitoring the offset to <100mV at the speaker terminals.
The pic is of my amp, pots circled.
If your board is different and/or you need direction I highly recommend Greg.
No more turn-off pop


AX TU1000C.JPG
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