Bogner Überschall Ultra EL34
13:17
Checking Out The Bogner Uberschall Ultra!
16:08
Mesa Quad Preamp: The Ultimate Alternative to the 2C+ Reissue!?!
6:54
Bogner Uber Ultra - What Does It Really Sound Like? Pretty Incredible
23:26
High Gain MONSTER: Bogner Uber Ultra EL34
2:41
Bogner Uber Ultra el34 100w vs KT88 150w
13:11
John Petrucci Master Class - Tone Demonstration
16:02
3 of the best amps EVER!
20:29