Koch ST20-C/EL84 Studiotone 20 Watt Class A 1 x 12" Combo | Midlothian Music

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Koch ST20-C/EL84 Studiotone 20 Watt Class A 1 x 12" Combo

via Koch

Koch ST20-C/EL84 Studiotone 20 Watt Class A 1 x 12" Combo

New Koch Studiotone 20 watt combo guitar amplifier.

Beginning with two EL84 power tubes in Class A, a newly designed speaker and cabinet, three foot switchable channels and two powerful voicing switches, the Koch Studiotone sound brings to mind the British valve amps of the 60's. The three channels (clean, overdrive & overdrive+) take you from round warm tones to saturated EL84 overdrive & compression. 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. Some of the big surprises are left for the back panel though, and a quick inspection reveals a serial effects loop, a recording output with microphone placement and cabinet style simulators, two line outputs (one unfiltered and one low level) and a Headphone Out jack. Speaker outputs at 4, 8 and 16 ohm allow for any combination of speakers and the built in Power Soak/Speaker on/off switch allow the amp to be played with the speaker turned off for recording or headphone use. There is also an short spring reverb tank, with front mounted level adjustment. The Koch Studiotone is one of the most versatile and lightweight guitar amplifiers with boutique tone. Plenty of headroom.


  • Koch Studiotone  
  • 20 Watts
  • 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
  • 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
  • 2 way footswitch included
  • Dimensions 17 w x 9 d x 17 h.
  • Weight Combo 38 lbs.

Midlothian Music provides FREE adjustments for life of owning this instrument.

Thanks for visiting Midlothian Music. Call us (708) 403-3733 with any questions. Proudly serving your music needs for over 55 years as a family owned business. Open 7 days weekly and shipping daily. We stock a large selection of Koch and Name Brand Amplifiers and are uploading new items regularly..

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Original Listed Price $ 1,467.86

Midlothian Music Price $ 1,099.99