Need help trouble shooting my BK ST 140

Stuartarm · 5th January 2012, 01:59 AM

I have a BK ST 140 witch has one channel that works normal and one channel that is very weak and thin unless I turn the balance all the way to that side and crank up the volume high but even then then the bass is nearly non existent...I have swapped speakers, cables, interconnects and source so I know for sure the amp is the issue...I am an electrician but I'm no electronics tech...If any one had this issue and has resolved it I would greatly appreciate some feedback...thanks

djk · 5th January 2012, 11:38 AM

Check the cap in the feedback loop to ground, and the input cap.

Stuartarm · 11th January 2012, 06:51 AM

Quote:

Originally Posted by djk

Check the cap in the feedback loop to ground, and the input cap.

Thanks djk...where would that be located?..I know the circuit board for the st 140 seems fairly simple looking...perhaps I should change all the caps??

djk · 09:59 AM

If you can provide a photo, I could mark it for you.

Otherwise, change all the small electrolytics (if over about 7 years old this is worthwhile anyway).

5th January 2012, 01:59 AM	#1
Stuartarm diyAudio Member Join Date: Dec 2011 Location: Calgary	Need help trouble shooting my BK ST 140 I have a BK ST 140 witch has one channel that works normal and one channel that is very weak and thin unless I turn the balance all the way to that side and crank up the volume high but even then then the bass is nearly non existent...I have swapped speakers, cables, interconnects and source so I know for sure the amp is the issue...I am an electrician but I'm no electronics tech...If any one had this issue and has resolved it I would greatly appreciate some feedback...thanks

5th January 2012, 11:38 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	Check the cap in the feedback loop to ground, and the input cap. __________________ Candidates for the Darwin Award should not read this author.

11th January 2012, 09:54 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	If you can provide a photo, I could mark it for you. Otherwise, change all the small electrolytics (if over about 7 years old this is worthwhile anyway). __________________ Candidates for the Darwin Award should not read this author. Last edited by djk; 11th January 2012 at 09:59 AM.

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