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-   -   Yamaha BX-1 monoblock (http://www.diyaudio.com/forums/solid-state/155734-yamaha-bx-1-monoblock.html)

XEAGLEKEEPER 27th November 2009 09:08 AM

Yamaha BX-1 monoblock
 
Anyone here on DIYaudio world have any first hand experience working on these rather rare Yamaha pieces. I have one with a rather annoying issue. And need a little assistance or moral support..:)
DC balance(offset) adjustments 8 & 9(-23db) will not adjust much lower than 190mv, #7 & 8 (0 db ) adjust into tolerance.

http://sportsbil.com/yamaha/bx-1-sm.pdf

jaycee 27th November 2009 01:40 PM

No on hand experience, but would suspect the input stage FETs

XEAGLEKEEPER 27th November 2009 04:14 PM

I guess thats a possibility ..,but That would have pretty much messed up adjustment # 6 for sure and possibly #7 as well.

XEAGLEKEEPER 28th November 2009 09:47 AM

Quote:

#7 & 8 (0 db ) adjust into tolerance.
Typo -- Adjustments # 6 & 7 (0 db) adjust within tolerance.


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