ML No27 problem

dbev · 30th March 2006, 03:10 PM

Hello all,

New to the group and I'm looking for any insight to a very strange problem. I drive a pair of B&W 801M's with a Mark Levinson No27.
Latley the bass would drop out and only the mids and highs would play. I went through all my connections to the speakers checked the xover boards in the speakers and found nothing. Checked the line input cables to the amp - perfect. But if I pick up the front of the amp and tilt it the woofers come back on. This is very repeatable. I think there is a relay on the output to stop turn on transients. Could it be the relay? Or maybe a board is bending when the amp is picked up closing a short. Any ideas?

Thanks

anatech · 30th March 2006, 03:21 PM

Hi dbev,
Welcome to DiyAudio!

Your fault may be relay contacts, or an intermittent solder joint. Shorts generally cause smoke, flames and other depressing things to happen.

If it isn't the relay, or if you are uncomfortable with this (electronics service), take in in to a good technician - not a cheap technician! They may be other things that could use attention.

-Chris

dbev · 30th March 2006, 05:33 PM

Thanks Chris,

I'm ok with digging into it. I was just wondering if anyone else out there has run into this problem so I don't have look at everything. I alway did want to look inside her.

Dave

anatech · 30th March 2006, 06:03 PM

Hi Dave,
A good tech. keeps an open mind until the fault is found.

-Chris

30th March 2006, 03:10 PM	#1
dbev diyAudio Member Join Date: Mar 2006 Location: mass	ML No27 problem Hello all, New to the group and I'm looking for any insight to a very strange problem. I drive a pair of B&W 801M's with a Mark Levinson No27. Latley the bass would drop out and only the mids and highs would play. I went through all my connections to the speakers checked the xover boards in the speakers and found nothing. Checked the line input cables to the amp - perfect. But if I pick up the front of the amp and tilt it the woofers come back on. This is very repeatable. I think there is a relay on the output to stop turn on transients. Could it be the relay? Or maybe a board is bending when the amp is picked up closing a short. Any ideas? Thanks

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30th March 2006, 03:21 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi dbev, Welcome to DiyAudio! Your fault may be relay contacts, or an intermittent solder joint. Shorts generally cause smoke, flames and other depressing things to happen. If it isn't the relay, or if you are uncomfortable with this (electronics service), take in in to a good technician - not a cheap technician! They may be other things that could use attention. -Chris

30th March 2006, 05:33 PM	#3
dbev diyAudio Member Join Date: Mar 2006 Location: mass	Thanks Chris, I'm ok with digging into it. I was just wondering if anyone else out there has run into this problem so I don't have look at everything. I alway did want to look inside her. Dave

30th March 2006, 06:03 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Dave, A good tech. keeps an open mind until the fault is found. -Chris

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