Bogner Uber Ultra - Uberschall Mk 2 - All Channels
23:26
High Gain MONSTER: Bogner Uber Ultra EL34
20:29
Bogner Uberschall Mk2: Boutique Tones, High-octane Sonics
11:46
Ampsims and input gain - Please, stop the madness...
14:38
Mesa Boogie Mark VII - All Channels
6:54
Bogner Uber Ultra - What Does It Really Sound Like? Pretty Incredible
1:04:04
The Unsung GIANT of Guitar
2:41
Bogner Uber Ultra el34 100w vs KT88 150w
17:21