• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Sansui B-2301 DC Offset

Magnus Back said:
First please download a copy of the Service Manual, you will need it. It also contains the DC and bias setting guides even though it might not be 100% clear how to do it.
In it you will find the following values for variable resistors:
View attachment 3073949

Sansui B-2301 Stereo Power Amplifier Manual | HiFi Engine

www.hifiengine.com www.hifiengine.com
Click to expand...

Thanks for the update, just checked these values of Bourns Multi turn trim pot on couple of sites, some of the values not available like 2.2k Ohm& 470 Ohm, Can we use the 2k Ohm & 500 Ohm as direct replacement, or do we need to look for the same value.
Thanks
 
yadvinders said:
didn't find the service manual can some one facilitates me with this content
Click to expand...
Don't want to sound critical, but did you even bother to check the link on HiFi Engine that Magnus Back provided ?
Stop asking to be spoon-fed, people, do your homework first and don't expect somebody else to do that for you.
There is plenty of information on this forum over the years - just make some effort and search for it.
 
DB-7 said:
The B-2301 is not something a novice should be messing with. Even the most experienced Techs find these amps complicated.
It will make an excellent doorstop if your not careful
Click to expand...
After all these questions I've been on the edge of making a post like that. ;)

Sansui B-2301L - something to keep me busy?

This beauty arrived yesterday - not mine, but belongs to another AK member who has asked me to give it the once over. Not quite sure how much I'll be doing to this yet, still learning where everything is, and assessing what might need attention. ;) It isn't reported as being faulty, but there...
audiokarma.org
 
Hi
I have service manual of the Sansui 2301 amplifier, tried to adjust the DC offset, because its out of specs, which is already set in permissible limits, now come to Bias adjustment, just measure the Bias on either end of main driver board, it’s in the range of 0.7 to 0.8 m volts, which need too set to be around 20 mv at all test points as per service manual, But amplifier running good, but as I feel low end response seems to be missing, does bias really impact the sound of amplifier
2nd in the service manual say 90 map at R71 & R74 of driver board, I think these are accessible from bottom by opening small plates.
Have complete Japanese manual with me, its scanned copy not able to translate, can someone translate the page no 14 only or assist me to adjust the bias adjustment.
What is the role of 2 variables on board no 3768 mounted on the back of amplifier, where to measure the dc voltage for the adjustment?

Thanks in advance
 

Attachments

yadvinders said:
Hi
I have service manual of the Sansui 2301 amplifier, tried to adjust the DC offset, because its out of specs, which is already set in permissible limits, now come to Bias adjustment, just measure the Bias on either end of main driver board, it’s in the range of 0.7 to 0.8 m volts, which need too set to be around 20 mv at all test points as per service manual, But amplifier running good, but as I feel low end response seems to be missing, does bias really impact the sound of amplifier
2nd in the service manual say 90 map at R71 & R74 of driver board, I think these are accessible from bottom by opening small plates.
Have complete Japanese manual with me, its scanned copy not able to translate, can someone translate the page no 14 only or assist me to adjust the bias adjustment.
What is the role of 2 variables on board no 3768 mounted on the back of amplifier, where to measure the dc voltage for the adjustment?

Thanks in advance
Click to expand...
Yes bias does affect the sound of the amp.

See below on the procedure.



1709825111036.png
 
I have Sansui B2301, which is currently biased at 7mv, during multiple listening sessions I have a feeling of missing bass artifacts, to get the full potential of amp what is the best value of bias value after running operation of 30 min with zero input signal, however service manual say 20mv. Any recommendation on it
 
You must log in or register to reply here.
Back
Top Bottom