Hi,

what does Q1 jfet do at the input of the power amp?

schematic

Thanks
belab

I will take a wild guess that it is there as a delay so there is no big pop as the amp is turned on.
The 1uF cap C25 is slowly charged up through the 10M resistor R45 until it turns the  Jfet on and allows the signal through. But I could be wrong.

Thanks, my guess was similar.
Happy new year!