QUAD 606 Mk2 Power amp PROBLEMS - diyAudio
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Old 1st March 2007, 12:27 PM   #1
arupg is offline arupg  Latvia
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Join Date: Dec 2005
Location: Riga
Default QUAD 606 Mk2 Power amp PROBLEMS

Hi

I notice a peculiar thing from my 606-mk2 power amp driving my B&W Matrix 802s. When I turn-on the amp while all rest of the gear is powered-off, I notice a slight buzz on the RIGHT channel speakerís Tweeter while the LEFT channel is totally clean & absent.

What could the source of this noise in the 606-II?

Your guidance will be most helpful. I do want to rectify this ASAP. Can it be one of the small value caps? If so, which one or where to look for in the amp.

Thanks in advance!


P.S. Anyone has a schematic of this amp or the new Quad 909?
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Old 2nd March 2007, 05:49 AM   #2
big jim is offline big jim  England
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Go to quad405.com
its part of Grace Audio and you will find the 606 circuit



all the best jim
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Old 2nd March 2007, 06:29 AM   #3
arupg is offline arupg  Latvia
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Thank you. That was a good lead....
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Old 3rd March 2007, 11:14 AM   #4
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Hi;

check the virtual ground circuit (T15/T16 and resistors).... if faulty, also have a look at C9/C11.

regards, audiomatic
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Old 3rd March 2007, 05:41 PM   #5
arupg is offline arupg  Latvia
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Thanks for the tips. C9/C11 220uF caps can be the cause. I am not sure that around T15/T16 and its associated resistors, if they could be the cause.

Do you think it could be some of the small caps located around the input area like around the opamp. Alternative is whether the opamp itself is wearing off......
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