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Yamaha B-2x Owners

Vint Age said:
It's probably not a good thing but I don't know the B-2x well enough to say for sure. It sure sounds like something not right about yours though.
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Yes I agree I think it could affect the sound as well I would have to find someone who knows more about them before I do bias and the other tests.
 
pete05 said:
I have just discovered something my B-2x Is the European version 220V 50HZ and I live in Australia where it is 240V 50HZ.

I have been monitoring our power output over the last few weeks (for other reasons) and its sits between 229V & 235V

Could this be bad for my amp?:thumbsdn:
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Although voltages are not specifically listed, the multi-tap transformer wiring diagrams are on the schematic sheet. A good tech can re-wire it internally for 240V. There might even be voltage tags on the wiring. You're not doing the amp any favors running the input voltage over the rating of the current setup.
 
Yea the problem is I don't know any good techs but I can open it up and have a look around. I would have thought that the transformers would have been different.... different input voltage to different output voltage.
 
So, what are the voltages on power rails ?

I suspect Yamaha was bright enough to have put in transformers with multiple windings for input, to cover the world markets, instead of having different transformers. Well, one hopes ...
 
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Will have to get back to you on that... bit busy it doesn't say in the service manual so I will have to pull it apart and check them.
 
There are a few different part numbers listed for the transformers in the parts list, possibly for the different Hz and possibly only the Japan-only model has the transformer(s) without multiple taps. The wiring diagram shown for the General (voltage selector) model will clue you in. I'm not going to make any specific direction with regards to the wiring because I don't want to be the bad guy that made you blow up your transformers.
 
Martin.Ca said:
So, what are the voltages on power rails ?

I suspect Yamaha was bright enough to have put in transformers with multiple windings for input, to cover the world markets, instead of having different transformers. Well, one hopes ...
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maybe in this case, but that isn't S.O.P. for them.
 
Mines European model and checking my wiring against general there is nothing there like that. Plus AK member 'avionic' says to use a variac or step down transformer.
 
pete05 said:
Mines European model and checking my wiring against general there is nothing there like that. Plus AK member 'avionic' says to use a variac or step down transformer.
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A step down transformer is an easy solution that won't cost you too much; then you'll be able to stop worrying and enjoy the amp. Just be sure to pick one with a proper VA rating. :thmbsp:
 
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