Circa 2016; my lovely 32" Proscan sadly met the street when its CRT died. I would have brought it to the local recycling center but for its weight and bulk. Along with its once, to my eyes, stunning picture, what had long amazed me was its sound quality when I connected my respectable 4-way sealed floor standing DIY speakers (15" woofers) to the Proscan's external speaker outputs. In my bedroom, though room gain further augmented low end response, beyond a likely tight impedance match, whatever IC or discrete amps were used in that TV delivered respectably low noise and distortion and nice tonality.

I've searched in vain for the schematic to that TV. Anyone have any facts about the overall audio amp design?

That was about the time of the CTC169 chassis. An awesome set.
Quite a few varieties of them where they used sub boards for different
feature levels.

73 Zeno

That was about the time of the CTC169 chassis. An awesome set.
Quite a few varieties of them where they used sub boards for different
feature levels.

73 Zeno

Yep, it seemed there was a dozen versions of the just the audio system in 169s, not to mention all the variations of comb filters, PIP adapters, etc...

John