HomeMesa F-50 and Ernie Ball MusicMan JP6 review Mesa F-50 and Ernie Ball MusicMan JP6 review Leave a Comment / By GSite_Editor / October 20, 2010 YouTuber, Natek0707, reviews the clean channel on the Mesa F-50, and the Ernie Ball Musicman JP6 signature guitar (piezo option). Click on the video to play.