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Luxman M-05, 105w class A
Luxman M-05, 105w class A
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Old 22nd February 2004, 05:00 PM   #1
KBK is offline KBK  Canada
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Default Luxman M-05, 105w class A

I was given one of these recently, with a blown channel that apparently, no-one, including Luxman, can fix. I have a working channel to work from at least. I was also given the tech book. Anyone interested in a a pic of the schematic?

For those that are unfamiliar with the unit, it is a 90lb, dual mono to the separate channel power cords, fan cooled-back breaker.

It is worth fixing, as everything is there.. that one channel just won't fire up dammit! Well, it does, but with a DC offset. Then it shuts down again. The biasing is way too high. Long story.

I seem to have bit of a history with these units too. For example, a C-05 (matching preamp) came straight from the factory with a situation where no-one from Luxman could make it work for more than a few minutes. For years, everyone in the Luxman tech group took a shot at it. It ended up in the basement of the head of the service department for about 8 years. NIB-DOA, basically. A $3-4k preamp.. screwed. I saw it sitting there one day as I visited. He told me the sad tale. He gave me a shot at it.

I took it home and took the cover off. I then plugged it in. Before turning on the unit I looked around for obvious faults. I saw, in one of the PS rails, there was a fet T0-220 (192?) transistor controlling a bipolar based T0-220 regulation stage. The fet and the bipolar were bent towards and touching each other. "Oh", I sez, "That's not good, it's gonna cause a problem. Thermal runnaways gonna get in there and the PS rail will be way off."

So I bend the two back apart. I turn the unit on and, of course, can't find any fault. That was it. Luxman was defeated on that one for 10 years!

Such is life.
"Extraordinary claims require extraordinary evidence." - Carl Sagan. Sometimes the claims aren't extraordinary. Sometimes the weakness of men's minds are the culprit. Mass mentality has nothing to do with obviousness or truths.
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Old 22nd February 2004, 05:19 PM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK
Default not exactly subtle

old skool design, checkout the power meters,
with peak hold noless, so a bit more useful,
worth quite a lot in working condition.

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Old 22nd February 2004, 06:32 PM   #3
slowmotion is offline slowmotion  Norway
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Location: Norge

I had one of those on loan many years ago,
it tripped the fuse when I turned it on , so I had to use an
extension lead to a 16A outlet down in the basement

If I remember corectly it sounded smoooooth,
but not very dynamic with Kef 107 speakers.

Worth fixing, I'm sure

- Jan -
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Old 5th August 2004, 10:00 PM   #4
neototem is offline neototem  France
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Join Date: Aug 2004
Location: Bois-Colombes
I've found one for sale, but both output have busted

the previous owner changed the output transistors, but the blowed again within minutes

do you reckon it could be fixed ?

I've no idea of the complexity of the design they used, but think something is wrong in the driver / pre output stage

any idea could help
thanks in advance
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Old 7th August 2004, 02:12 AM   #5
anatech is offline anatech  Canada
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Luxman M-05, 105w class A
Hey KBK,
Cool, the old Lux crew weren't great at troubleshooting. I have a C-05 as well. Great preamp. Need knobs as they were stripping it.
The M-05 is a great unit. Which direction is the offset in? I have the manual as well, I'll have a look.
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Old 31st August 2004, 03:20 PM   #6
neototem is offline neototem  France
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the M-05 is back home : wow : that's really heavy
I ordered the service manual, just received it : I will try to put it back to work
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Old 23rd January 2010, 05:51 PM   #7
ECS21 is offline ECS21  Canada
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Hey Anatech, Can you send me the manual? I have One that needs repair.
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