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I have a luxman m-117 the left channel stops working

I do not have the mannual.i am using a marantz sr6400 as a pre amp. the luxman was given to me,works great. there is a switch at the back blt opperation on or off.The left channel cuts out after 2hr of use!! PLEASE help

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Hiya, the first thing that comes to mind for me is the bias setting is incorrect. This is a common mod done by many people that often leads to bad things! The good thing is that it does sound likely as everything is OK at this point (hopefully).

I suggest it goes in to be checked and get someone who knows amps to set the bias correctly. I would advise you try (unless you have a bit of experience with meters etc) as things can go bang.
The bias setting for the amp are 0.5mv between TP1/TP2 and same on other channel TP3/tP4

Hope that helps

Posted on Jul 26, 2009

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Hi There, I have a Marantz SR7005 Receiver and Bose 901 Series VI speakers with the Bose equalizer. I'm struggling to figure out the best way to connect the Bose equalizer/speakers to the SR7005. ...


It sounds like you've read one of my many posts on 901 deployment in the AV world.

Functionally, what is the difference between one amp with 'x' channels or 'x' mono amps? Nothing. Pre-outs don't know or care what else an external amp does.

According to this link http://www.ecoustics.com/electronics/products/new/642968.html those amps are 2- and 5-channel, respectively.

There was a time when I had two bridged-mono Carver Cube atmps (at a real 400 watts) pushing one 901 each but that was big time overkill.

I now use a Carver AV-406 (functionally the same as your MM7055) with the 901 EQ in between the AV Receiver's front pre-outs and two 110-watt channels. Other channels on the AV-406 pull subwoofer and surround back duties. My AVR directly powers only the center and surround speakers.

The MM7025 would work for you.

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I'd do some more investigation first. Have you determined if the amplifier for the channel works or if it's a preamp problem using the built-in speaker setup controls?

With this unit's great audio processing features you might be able to bypass a failed amplifier using the pre-outs and drive an external amp for the missing channel.

You could always just get a modest stereo amp (like a Carver M-100T and bridge it), or use the extra channel for another center speaker or a subwoofer, for example.

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Yes, connect the Active EQ into one of the abundant tape loops and set the receiver to monitor that one constantly. Or place it between the Pre Out and Main In's. What you don't want to do is have the Active EQ in front of any actual tape decks attached to the Luxman as it would affect their audio. Yeah, pre/main is the best place.

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There will be a pre-amp in the turntable too, presumable you have checked the cartridge, and the everything on the turntable for bad connections?
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