The Koch Studiotone 20 Combo: 

Smart Tools for the Modern Player
Long before the industry leaned on digital workarounds, Koch packed the Studiotone with forward-thinking, utilitarian features that are just as vital today as they were 20 years ago:

• Built-in Power Soak & Speaker On/Off: Run the tubes hot at full volume and record or practice in complete silence without waking the neighbors.
  
  
• Analog Recording Output: A direct-to-desk line out featuring authentic speaker voicing and mic-placement simulation—no microphones or software plugins required.
  
  
• Gig-Ready Routing: Fully equipped with a serial effects loop, short-scale spring reverb, headphone output, and multiple speaker jacks (4, 8, and 16 ohms) to drive any external cabinet.
  
  
  

Whether you are tracking in a home studio, rehearsing, or holding your own on a club stage with a live drummer, the Studiotone 20 remains a timeless masterclass in functional, high-performance analog design.

Two Decades of Pure Tube Innovation

Don't let the compact footprint fool you—the Koch Studiotone 20 Combo is a legendary, stage-worthy powerhouse that has been a benchmark in tube amplification for 20 years. When it was launched two decades ago, it completely redefined what a compact amplifier could do, proving that true boutique tone doesn't require a massive stage rig.
Driven by a Class-A power section with two EL84 tubes and a custom-voiced VG12-60 speaker (developed with Jensen), the Studiotone delivers a rich, organic sound that punches far above its weight class.


A Swiss Army Knife for Every Guitarist
The Studiotone 20 was built from day one to be an amp for all players, seamlessly adapting to any musical style. With three foot-switchable channels (Clean, Overdrive, and Overdrive Boost) and flexible front-panel voicing controls (Mid-Shift and Bright switches), you can effortlessly pivot from sparkling, warm American cleans to rich British crunch, all the way to modern, high-gain saturation.

A CLOSER LOOK

VG12 60 speaker

Voiced to perfection. The custom Koch VG12-60 speaker bridges the gap between classic American sparkle and rich British crunch, specifically engineered to maximize the Studiotone's EL84 tube dynamics.

TONE VOICING

The 2-way ‘Mid Shift’ allows you to boost the mid frequencies around 800 Hz, and the 3-way ‘Bright’ switch allows you to cut or boost the high frequencies for fine tuning the top end.

RECORDING / PA OUT

Launched over 20 years ago and still unmatched. The Studiotone's fully analog recording output features built-in speaker voicing and mic placement simulation, delivering timeless tube warmth directly to your tracks.

SPECIFICATIONS:

Amp configuration 

1. Class-A design 3x 12AX7 Pre-amp tunes
   
2. 2x EL84 Powertubes
   

The TONE

1. ​3 channels (Clean, Overdrive & Overdrive boost) foot switchable
   

• One set of passive bass-mid-treble tone controls
• Two front-panel voicing switches
  (mid-shift 2 way, bright 3 way) for all channels
  

Connectivity and OUTPUT

• Custom designed VG12-60 Koch 12" speaker
  
• 4, 8, & 16 Ohm speaker outputs plus speaker on/off switch
• Serial effects loop (10 dBV signal level)
• Recording output with speaker simulation and 2 voicing filters
• Direct outputs (non-filtered, clean channel & headphone)
• Short scale three spring reverb tank
  

HARDWARE & HANDLING

​-Two button footswitch (included) with:
* Channel select
*  Gain Boost or Reverb on/off
(Selectable on back panel)​

COMBO DIMENSIONS & Weight

• Dimensions 44,5 w x 23,5 d x 43,5 h.
  
• Weight 15 kg