Yamaha BX-1 monoblock

XEAGLEKEEPER · 09:26 AM

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.

27th November 2009, 09:08 AM	#1
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	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 __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...* Last edited by XEAGLEKEEPER; 27th November 2009 at 09:26 AM.

27th November 2009, 04:14 PM	#3
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	I guess thats a possibility ..,but That would have pretty much messed up adjustment # 6 for sure and possibly #7 as well. __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

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27th November 2009, 01:40 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	No on hand experience, but would suspect the input stage FETs

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