Grosser Muk (Big Muk) Head

NEW: strengthening for our Little Muk: the Big Muk 50W head.

The preamp with its 2 ½ channels, coming from our Little Muk, was expanded with extensive tone controls and the FX loop here is foot-switchable (& can be used as a clean solo-volume-boost).
Again in a light and compact case - suitable for upright 2x12" cabinets.
-> Video- & audio- demos see below. Audio provisional from 'Kleiner Muk' 1x12" combo (same preamp, but ca.1/3 of the power & less deep-bass-reserves than bigger cabinets)

  • NGMT front per 1769 1000
    Grosser Muk Portrait
    57x48x26cm (W/H/D), 20kg
  • NGMT rueck 1765 1000
    Grosser Muk rear view
  • NGMT Detail Bedienung
    Grosser Muk - operation
  • NGMT Detail Clean
    Grosser Muk - clean channel
  • NGMT Detail Drive
    Großer Muk - drive channel
  • NGMT Detail Master
    Grosser Muk's Master-Section
    With FULL/HALF (center position = standby) & SE/PP 4 power levels are selectable.
    (SE = Single Ended = Class-A, PP = Push-Pull = Class-AB)
  • NGMT rueck Detail FS Supply s
    Grosser Muk - rear connectors #1
    - Power Supply
    - Footswitch
  • NGMT rueck Detail FX
    Großer Muk - rear connectors / controls #2
    - FX-Loop serial / parallel
    - Boost-Level-Pot (f. Drive-Channel)
  • NGMT rueck Detail SPKR s
    Grosser Muk - rear connectors / controls #3
    - Speakers 4 - 8 - 16 Ohms
    - Poweramp Tone
    - Line-Out (e.g. additional amp)
  • NGMT rueck Detail Bias s
    Großer Muk - rear / bias
    - bias-pot + 3-color-LED

Everything is possible, from mellow jazz tones with a strong bass or brilliant & twangy clean to fresh blues-crunch/overdrive to singing fat high-gain lead. All available via the footswitch (clean / drive / drive+boost).

Thanks to its 4 switchable power levels, the Big Muk too offers a rich tube sound full of overtones in any situation from living-room-level to bigger stages.

Or simply enjoy the different sound formations in the various power levels according to your own taste.

The compact size fits perfectly to our upright 2x12" cabinet (identically with TWSP 212-II) or to our 1x12" cabinet (both will be available soon, resp. on demand).

Detailed features of Grosser Muk:

Clean Channel

  • Effective working tone controls, consisting of bass & treble pots plus mid-boost switch.
  • The Bright switch brings more brilliance or more twang, depending on the position of the Volume control.
  • Depending on your sound-idea (really clean, twangy or slightly crunchy) you can virtually influence the gain via Volume control.
    And via the tone controls (situated prior to the Volume in the circuitry) you can choose which frequencies are crunched more. E.g. basses less and treble more - what is recommended when Volume is wide-open (crunch).

Overdrive Channel

  • Extensive, effective working tone controls.
  • Boost switch (foot- switchable): this adds an additional tube stage, resulting in a richer distortion structure and producing a very thick / bearing / creamy high gain lead sound.
    For fat sounding guitars or pickups, resulting in a muddy tone at the lower or palm-muted strings, it may be indicated to use the Tight switch.
  • Tight switch (to prevent a sludgy tone): Reduces the basses and some of the deep mids at the 1. tube-stage to create a tight tone and to avoid muddy sounds when with high gain (e.g. at high gain with the neck-humbucker on).
  • Sound Examples:
    • with treble fully ccw, mids at max. & basses to taste, you'll get a great midy & creamy sound.
    • with treble far cw & highest gain you can even get old-school-metal sounds. Otherwise, all is possible from "dirty clean" to bluesy & rocky sounds to fusion.


  • Presence controls the upper highs.
  • The foot-switchable effects loop can be setted in series or in parallel. You can adjust the send level via potentiometer and the return gain can be set in two different levels. So it is ready for every conceivable device.
  • Reverb (foot- switchable): 2 seperate controls for clean and drive channels.
  • 4 power levels are available via 2 switches:
    • Full / Half (center position = standby) switches the operating mode of the output tubes, reducing their power by 50%.
    • SE/PP: SE (single-ended) = Class-A (only one output tube is operating) / PP (push-pull) = Class-AB (both output tubes work).


  • Preamp: 4x ECC83/12AX7 from Sovtek (V1, V2) & JJ (V3, V4).
  • Power amp: 2x 6L6GC from Sovtek (EL34 od. KT66 may also be used), simple tube replacement with a smart bias-adjustment on the rear side (basically, anyone can do it: to adjust the bias simply set the recessed pot, so that the 3-color LED shows green).


  • You can use 1 or 2 cabinets with 16 ohms, 1 or 2 with 8 ohms or 1 with 4 ohms.