Posted by Bill on April 07, 2002 at 08:42:39:
In Reply to: Electric Tuba posted by Antonio (Australia) on April 05, 2002 at 09:18:23:
In an issue of Tuba Journal I saw an article about a guy who built electrically assisted valves. Perhaps you were only interested in the amplification, as the other posts suggest. I am not home now, so i cannot check the issue.