With the term TWIN JET, Bogner refers to having two powerful gain channels on tap versus the more traditional clean and gain channel configuration on the standard Uberschall.
Here are the main differences, details are explained below.
Re-voiced clean channel which can deliver semi cleans to hot rodded high gain flavored sounds
Super high gain channel retained but additional flexibility
KT88 power amp section with expanded controls
The new clean channel features the same controls like the standard Uberschall but with an entire new circuit. You will be able to dial in clean sounds but the ability of super clean ones are diminished, while this is true for humbucker equipped guitars with single coils you'll still be able to get fairly clean. In addition, now you can use this channel as a second gain channel. The gain of this channel does not match the super high gain of the other channel, but it will give you the ability to set it anywhere from Semi Clean to Plexi to JCM to Hot Rodded.
The super high gain channel is identical to the standard Uberschall with the exception that the presence control is now in the channel circuit itself rather than the power amp. The power amp presence control from the standard Uberschall is the same as the TwinJet's master presence control, which affects both channels on the TwinJet. So the super high gain channel's presence control is an additional tone and feel shaping control.
The power amp section of the TWIN JET has a quartet of KT88's which runs on higher plate voltage then the standard Uberschall. This gives you a raging 150+ watts with more articulation and quicker response. Control over the power amp was expanded via a depth and presence control besides the master volume control already found on the standard Uberschall. These controls affect both channels and let you dial in overall low end response and presence.
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