canuckaudiog
On a quest for high fidelity
Someone shared this with me and I wanted to share it with the group here :thmbsp:
Being a cap coupled unit you can't measure DC offset at the speaker terminals. But there is another way.
To adjust DC offset, put your positive lead on this leg of R847/R848, and black to ground, and use the trim pot marked to adjust the voltage to 28 volts:
To adjust bias, put your positive lead on one leg of R843/R844 and the negative lead on the other leg (best to have alligator clips for this). Let the unit warm up for at least 10 minutes before doing this. Put all settings to OFF, balance to the middle, no input selected, etc. Adjust with the trim pot closest to these resistors and adjust it to 10mV.
I did mine and it sounds quite a bit better and it was a simple adjustment. Of course, always exercise caution working inside electronics that are hot (live, turned on). You don't wanna fry something or electrocute yourself.
Being a cap coupled unit you can't measure DC offset at the speaker terminals. But there is another way.
To adjust DC offset, put your positive lead on this leg of R847/R848, and black to ground, and use the trim pot marked to adjust the voltage to 28 volts:
To adjust bias, put your positive lead on one leg of R843/R844 and the negative lead on the other leg (best to have alligator clips for this). Let the unit warm up for at least 10 minutes before doing this. Put all settings to OFF, balance to the middle, no input selected, etc. Adjust with the trim pot closest to these resistors and adjust it to 10mV.
I did mine and it sounds quite a bit better and it was a simple adjustment. Of course, always exercise caution working inside electronics that are hot (live, turned on). You don't wanna fry something or electrocute yourself.