Thermionic Culture Fat Bustard MKII 12 Channel Valve Mixer


Thermionic Culture Fat Bustard 12 Channel Valve Mixer




The Fat Bustard mk II is an all valve passive input summing mixer. It has 14 inputs with four stereo inputs, four mono pan-able inputs and 2 ‘Aux’ inputs with a pan switch. The Fat Bustard is exclusive in it’s outstanding sound high quality as well as the additional degree of manage and processing it offers more than the stereo mix output. The mk II version is now the normal production model and it has been upgraded to consist of a monitor output with level handle.

A lot in the eye-catching sound supplied from the Fat Bustard is down towards the option of valves utilized. The summing is carried out by a pair of 5965 valves and also the output stage uses a pair of 6SN7 valves. This combination gives an incredibly big volume of headroom plus a exclusive smooth sounding response. It’s also worth noting that the unit has “semi-floating” inputs and unbalanced outputs. This was a choice created in the design stage purely because the unit sounded much better this way and performed excellently when connected for use in all circumstances.

The Fat Bustard employs our distinctive “varislope” curves for top rated and bass lift. Because the control is turned up, the peak frequency in the curve becomes a lot more extreme so as to add heavier bass/brilliant bestwithout the hardness present in solid state eqs. The bass and best cuts provide a selection of choices to tailor the sound – too many to list right here. They can be obviously independent from the lifts. All controls influence both stereo channels equally.

The ‘Attitude’ handle will be the subsequent to control the sound of the mix.This switched control steadily increases the amount of harmonic distortion inside the stereo summing stage. It is fairly subtle (at the least within the reduce positions) to provide just the best level of 2nd harmonic content to get a stereo mix. At higher positions the mix might be rather aggressive.

The stereo spread control permits the stereo to become widened by a continuous quantity more than a selectable frequency range.

The ‘Spread filter’ handle enables the frequency above which widening happens to be selected from total band widening to only widening above 5KHz. Again, this handle might be employed to vary the tone in the stereo mix at the same time as the stereo width. Together with stereo widening at greater frequencies.

The ‘Bass to Centre’ handle permits bass frequencies inside the stereo mix to become summed to mono for two diverse low frequency ranges, plus there is a setting for all frequencies to mono.

A Stereo ‘balance’ control and rotary 31 position ELMA switch for ‘Output level’ give total control over output levels.

The ‘Monitor level’ control, int/ext switch and extra outputs provide a helpful way to connect and control monitors towards the Fat Bustard. Particularly beneficial when the Fat Bustard will be the only mixer becoming employed. If this is not a requirement then the int/ext switch in conjunction with all the monitor outputs can be used to provide an insert in/out switch.



  • All valve 14 channel passive summing mixer with many extras !
  • Pan controls on 4 channels.
  • Unique Varislope Top and Bass lifts plus filters.
  • ‘Attitude’ control to add harmonics.
  • Stereo width controls / Bass to centre and mono.
  • Precision ELMA switch to control main level (fadeable).
  • Monitor outputs with level control and switching.
  • Hand wired with point to point wiring throughout.
  • Exceptional sound quality- very low distortion except when required and massive ‘headroom’.
  • Frequency response extends from below audio range to well above.


Weight 33 lbs



Thermionic Culture

Thermionic Culture

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