"PURE TUBE SOUND with KOCH ATR"
FULL TUBE VERSUS ATRWhile the guitar amplifier market has evolved significantly over the years, the sound of a full-tube amplifier remains the gold standard for many guitarists. As not every guitarist can or wants to play a full-tube amplifier for various reasons, there are numerous attempts to replicate this sound using alternative technologies. For a guitarist to truly embrace an alternative, it's crucial to replicate the playing experience as closely as possible.
Koch has achieved this with their ATR (Authentic Tube Response) technology, which not only delivers a remarkably authentic tube-like sound but also captures the dynamic response and feel of a traditional tube amplifier. 
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JUPITER SERIES "MODERN BOUTIQUE".The Koch Jupiter series offers a variety of boutique, vintage-style amplifiers based on the original Koch ATR technology.
These amps were designed with the player in mind, providing maximum tonal control and flexibility in a compact, lightweight combo or head format. This hybrid design is equally suitable for home use, live performances, recording sessions, or rehearsals. 
How does ATR (Authentic TUBE REsponce) Work?ATR has, in addition to a 12AX7 tube in the preamp, also a 12AX7 tube in the power amp section. All sound generation in ATR happens in a completely analog tube circuit, just like in a full tube amplifier. However, the tube in the power amp section provides the dynamics of a power tube, not power. The actual power is delivered by a MOSFET amp at the end.
A significant detail is that many people don't know the difference between a transistor and a MOSFET! The most important difference is... Dynamics! The efficiency of a MOSFET is higher than a transistor. Koch is the only brand that uses MOSFETs in the power amp. A MOSFET is a 1:1 replacement for a tube. A MOSFET in the power amp sounds more dynamic and delivers more "power" than a transistor. A MOSFET typically goes 3 times as hard as a transistor with the same value. 
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