Yamaha B-1 Power amp with UC-1 control - diyAudio
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Old 11th March 2011, 03:39 PM   #1
Lstuard is offline Lstuard  United States
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Default Yamaha B-1 Power amp with UC-1 control

I have a B-1 power amp which just went into overload protection. It worked well ..then nothing. The C-1 still functions perfect. Can anyone suggest a repair center that can handle this unit? I only want a very good one.
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Old 11th March 2011, 08:09 PM   #2
cdfac is offline cdfac  United States
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does it still go into protection when it's switched to an output with no speaker connected?
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Old 11th March 2011, 08:27 PM   #3
Lstuard is offline Lstuard  United States
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Yes it does. I switch it real quick to speaker 5 and turned it on. It went straight to protect mode.
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Old 12th March 2011, 08:11 AM   #4
djk is offline djk
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Inquire direct to Yamaha.

The B1 is difficult to work on, and parts may be un-obtainable. Yamaha has a set of card extenders to make it easier to service this amplifier.
Candidates for the Darwin Award should not read this author.
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Old 2nd May 2011, 08:46 PM   #5
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Location: PARIS
Hello Lstuard,
Refix a Yamaha B1 is not really easy and in my point of view only a meticulous tech can do it perfectly with the service manual complete.
To my knowledge , the only company who can do it here in France is Nagaoka.fr
try to contact them and they maybe abble to repair it . But in any case it will cost you a lot of money because original spares parts are difficult to find and they will probably not waste their stock .
Just try and keep us informed if you are successfull or not
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Old 1st August 2014, 07:34 AM   #6
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Default Yamaha B1 amp repair


This link do not work anymore try : cliniqueaudio@orange.fr
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Old 1st August 2014, 01:34 PM   #7
ilimzn is offline ilimzn  Croatia
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Location: Zagreb
Likely a leaky transistor in the main power regulator, or open or problematic contact on one of the current sense resistors in the same area.. Not easy to diagnose or fix without knowing what you are doing. I would suggest going over to audiokarma.org and asking, there are people who can fix these.
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