Picking up a 77 SF Champ next week from a buddy. Its the non reverb,non tremolo in pretty good shape. I had a chance to play it a few months ago and fell in love with it. I know there is a speaker upgrade, not sure what exactly but will come with the original for what its worth. New tubes and inspected not too long ago. Anyone put in a 10 in. speaker in one? Will post pics when i get it.