Lightly used compact Koch Studiotone tube amp head from Koch which is based in the Netherlands. Milwaukee's own Greg Koch has been an endorser as well as Randy Bachman. For the last four years this has been used under twenty hours total.

Here's the specs form the Koch website: Beginning with two EL84 power tubes in Class A , three foot-switchable channels, and two powerful voicing switches, the Koch Studiotone sound is probably best described as a modernized version of British tube amps of the 60s. The three channels (Clean, Overdrive & Overdrive+) take you from pristine clean 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.

The back panel features 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 and Speaker on/off switch allow the amp to be played with the speaker turned off for recording or headphone use. There is also a short scale spring reverb tank, with front-mounted level adjustment.

Koch Studiotone Head Specifications.
• 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
• 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 17.3 inches w x 9.1 inches d x 8 inches h
• Weight 22 pounds

From Koch Tech Support: In order to best service our customers and product users we have designed and built the amps to allow easy servicing and access to components. We have no double-sided PC boards with unreachable parts on the bottom side. Instead, all our parts are on the surface and have extra long ends so they can be replaced in no time. All our opamps are on sockets and therefore easy to replace. The PC boards are designed in such a way, that the circuit is easy to follow. Furthermore, we added trim pots and measuring points to simplify the biasing process of the amp to make replacing tubes a quick 10 minute job.