I know that there is a preset located at the input stage of the power amp section,is it for offset adjustment or something else?😕
DC Offset alignment.
1. Warm up 5 minutes min.
2. Set volume at minimum.
3. Connect voltmeter across left speaker, 100-300mV DC scale, speaker positive to meter red.
4. Adjust VR5 (left) for meter zero.
5. Repeat for right channel (VR6)
VR5, 6 trimpots are 20k on my schematic.
1. Warm up 5 minutes min.
2. Set volume at minimum.
3. Connect voltmeter across left speaker, 100-300mV DC scale, speaker positive to meter red.
4. Adjust VR5 (left) for meter zero.
5. Repeat for right channel (VR6)
VR5, 6 trimpots are 20k on my schematic.
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