QUAD 606 Mk2 Power amp PROBLEMS

arupg · 1st March 2007, 12:27 PM

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 speaker’s 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?

big jim · 2nd March 2007, 05:49 AM

Go to quad405.com
its part of Grace Audio and you will find the 606 circuit

all the best jim

arupg · 2nd March 2007, 06:29 AM

Thank you. That was a good lead....

audiomatic · 3rd March 2007, 11:14 AM

Hi;

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

regards, audiomatic

arupg · 3rd March 2007, 05:41 PM

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......

1st March 2007, 12:27 PM	#1
arupg diyAudio Member Join Date: Dec 2005 Location: India	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 speaker’s 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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2nd March 2007, 05:49 AM	#2
big jim diyAudio Member Join Date: Feb 2006 Location: london	Go to quad405.com its part of Grace Audio and you will find the 606 circuit all the best jim

2nd March 2007, 06:29 AM	#3
arupg diyAudio Member Join Date: Dec 2005 Location: India	Thank you. That was a good lead....

3rd March 2007, 11:14 AM	#4
audiomatic diyAudio Member Join Date: Mar 2004 Location: RLP	Hi; check the virtual ground circuit (T15/T16 and resistors).... if faulty, also have a look at C9/C11. regards, audiomatic

3rd March 2007, 05:41 PM	#5
arupg diyAudio Member Join Date: Dec 2005 Location: India	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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