Koch ST20/C112 Studiotone Guitar Amplifier – 20W Class A Combo, 12” & 3 Channels

The Koch ST20/C112 Studiotone is a 20W Class A tube combo that combines compact size with unparalleled versatility and a rich, tube-like sound. Equipped with two EL84 tubes , a custom 12” Koch VG12-60 speaker , and three switchable channels (Clean, Overdrive, and Overdrive+), this amp delivers everything from warm cleans to classic British overdrive. A 2-way Mid Shift and 3-way Bright switch allow you to fine-tune the tonal character of each channel to suit your playing style.

The rear panel offers an impressive array of features: a speaker-emulated recording output with two voicing filters, a headphone out , unfiltered line outs , an effects loop , a power soak , and a speaker on/off switch for silent recording or practicing with headphones. With speaker outputs for 4, 8, and 16 ohms, the Studiotone is flexible in use with various cab configurations. Add a real spring reverb and the included footswitch, and you have one of the most complete and compact tube combos on the market.

Specifications:

• Type: Class A tube guitar amplifier combo
• Power: 20W
• Output tubes: 2x EL84
• Speaker: 1x 12” Koch VG12-60 (custom designed)
• Channels: 3 (Clean, Overdrive, Overdrive+) – switchable via footswitch
• Tone Controls: Passive Bass, Mid, Treble
• Voicing switches:
• Mid Shift (2-way)
• Bright (3-way)
• Reverb: Spring-type (3-spring Short Hall)
• Effect loop: Serial, at -10 dBV
• Recording output with speaker simulation and two voicing filters
• Direct outs:
• Unfiltered
• Clean channel out
• Headphone out
• Speaker outputs: 4, 8 and 16 Ohms
• Speaker on/off switch (for silent recordings)
• Power Soak function
• Included: 2-way footswitch
• Dimensions: 44.5 x 23.5 x 43.5 cm
• Weight: 15 kg

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