Koch J20/C110B Jupiter Junior Guitar Amplifier – 20W Combo, 10” Jensen Speaker, ATR & Reverb
Official Koch dealer • 2-year warranty
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Customers give us an average rating of 4.8 out of 5
Customers give us an average rating of 4.8 out of 5
Our reviews come from various platforms. You'll find reviews on Trustpilot , Trusted Shops , Google , Marktplaats , Reverb , and our social media accounts. This gives you an honest picture of what customers think of us.
14 days free returns
14 days free returns
We believe in the quality of all our products! Not completely satisfied? Don't worry, you can easily return the item free of charge . This way, you always shop risk-free!
Free shipping from €75
Free shipping from €75
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Germany: €7.95 above €75 free!
Belgium: €7.95 above €75 free!
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Worldwide shipping
Worldwide shipping
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Description
Description
The Koch J20/C110B Jupiter Junior is a powerful and versatile 20W combo guitar amplifier from Koch's renowned Jupiter Series. This compact amplifier delivers authentic tube dynamics and response thanks to the ATR (Authentic Tube Response) concept, featuring a 12AX7 tube in both the preamp and power stages. The Jupiter Junior is equipped with a high-quality 10" Jensen Falcon speaker that delivers a rich, dynamic tone, from clear clean to powerful overdrive.
The amplifier offers three switchable channels: Cool (clean), Hot (overdrive), and Hot Gain Boost. Each channel has its own volume or gain control and shares a three-band tone control. The built-in reverb is based on a classic spring emulation and adds extra depth to your sound. With features like a dimmer (continuously adjustable from 0 to 20 watts), a speaker on/off switch, and a recording output with speaker emulation, the J20 is also perfect for silent practice and studio recording.
Specifications:
- Type: Combo guitar amplifier
- Power: 20W (infinitely variable)
- Technology: Hybrid ATR (Authentic Tube Response)
- Tubes: 1x 12AX7 (preamp), 1x 12AX7 (power amplifier)
- Speaker: 1x 10” Jensen Falcon C10-40
- Channels: 3 (Cool, Hot, Hot Boost – via footswitch)
- Regulations:
- Cool channel: Volume
- Hot channel: Gain & Volume
- Tone Controls: Bass, Mid, Treble (shared)
- Reverb: Spring emulation with volume control
- Effect loop: Buffered, serial
- Speaker on/off switch for silent recording
- Recording out with passive speaker emulation
- Output for external speaker
- Included: 2-way footswitch
- Dimensions: 45 x 42 x 23.5 cm
- Weight: approx. 12 kg







