Need help trouble shooting my BK ST 140

S

Stuartarm

Member

Joined 2011

2012-01-05 2:59 am

#1

• 2012-01-05 2:59 am

• #1

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

R.I.P

Joined 2001

2012-01-05 12:38 pm

#2

• 2012-01-05 12:38 pm

• #2

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

 

S

Stuartarm

Member

Joined 2011

2012-01-11 7:51 am

#3

• 2012-01-11 7:51 am

• #3

djk said:

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

Click to expand...

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

R.I.P

Joined 2001

2012-01-11 10:54 am

#4

• 2012-01-11 10:54 am

• #4

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).

An externally hosted image should be here but it was not working when we last tested it.

 

Last edited: 2012-01-11 10:59 am

S

Stuartarm

Member

Joined 2011

2013-02-21 8:42 am

#5

• 2013-02-21 8:42 am

• #5

djk said:

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).

An externally hosted image should be here but it was not working when we last tested it.

Click to expand...

thank djk...got me a crazy guy upstairs to replace the caps and yes there was improvement