Here is my post when I had some things done to my Adams E3, to include replacing the original leadpipe with a sterling silver leadpipe. Read through...
You might be interested in taking a look at these comments of Noah Gladstone's (Brass Ark) on leadpipes in trombones. In general, copper is supposed...
Good question, I changed the leadpipe on my Geneva from yellow to red brass, because there was red rot in it (It was already there when I bought it)....