Thank you for the reply, and for the gain info. I will give it a try as a line stage and see if I would prefer more gain. ( I will also see if the volume control needs to be replaced too.) And I will replace the opamps too.
One more question- from the schematics I see that the output of the line stage is a 560R in series and a 24k to ground, and the headphone amp is just 100R in series. Is there any need to change it for line stage use?
Thank you again- it’s very generous of you to spend time on this for me.