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Old 27th November 2009, 09:08 AM   #1
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Default 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
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Last edited by XEAGLEKEEPER; 27th November 2009 at 09:26 AM.
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Old 27th November 2009, 01:40 PM   #2
jaycee is offline jaycee  United Kingdom
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No on hand experience, but would suspect the input stage FETs
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Old 27th November 2009, 04:14 PM   #3
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I guess thats a possibility ..,but That would have pretty much messed up adjustment # 6 for sure and possibly #7 as well.
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Old 28th November 2009, 09:47 AM   #4
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Quote:
#7 & 8 (0 db ) adjust into tolerance.
Typo -- Adjustments # 6 & 7 (0 db) adjust within tolerance.
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