Thanks Tim, My headphones are stereo without a switch. Sounds like using a mono jack and mono plug for the headphones may be the best thing to do.
Then using mono plugs on speakers will work OK. I am also going to install an IC socket for U1. Seems that is a good idea for these audio amp chips.
I am off to Gateway Electronics today. Guess I will see if they have TDA2822M type FCI or WX. I will get the FCI type if possible.