LM3875 and LM3886 are very hard to find and buy.
LM1875 is however around in plenty.
So. let us use LM1875 to build good sounding chip amps.
I have the LM1875 SPICE Model.
You can download it from here: https://www.ti.com/product/LM1875?keyMatch=LM1875#design-development
In my attached image I use the potentiometer R5 to adjust for DC-Offset.
It is nice to have close to zero on the output.
LM1875 is however around in plenty.
So. let us use LM1875 to build good sounding chip amps.
I have the LM1875 SPICE Model.
You can download it from here: https://www.ti.com/product/LM1875?keyMatch=LM1875#design-development
In my attached image I use the potentiometer R5 to adjust for DC-Offset.
It is nice to have close to zero on the output.
Attachments
Nice chip. Many yrs ago i built one from a discarded subwoofer system & later sold that to a friend. Because it is the last surviving one of its kind, in the recent past i purchased couple of LM1875 for my future plans. Actually it's nice to have such cute power amplifiers, he he..... 
Anyway i can see you didn't use recommended boucherot cell(zobel) values, although not critical but i want add something. The zobel RC must be 'empirically' sized (by means of observation or experience rather than theory or pure logic). There must be some reason for choosing 1R resistor & 0.22uf cap as zobel instead of more common 10R & 0.1uf.
Regards
Anyway i can see you didn't use recommended boucherot cell(zobel) values, although not critical but i want add something. The zobel RC must be 'empirically' sized (by means of observation or experience rather than theory or pure logic). There must be some reason for choosing 1R resistor & 0.22uf cap as zobel instead of more common 10R & 0.1uf.
Regards
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