Thermionic CultureFat Bustard II Summing Mixer (Unbalanced)


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Thermionic Culture Fat Bustard II

The Fat Bustard II, from Thermionic Culture, is a completely passive input summing mixer with 14 inputs (4 of them stereo), 4 pannable mono inputs, and 2 aux inputs with a dedicated pan switch. All of this imparts on the unit’s exceptional sonic quality by providing an extra layer of malleability.

Thermionic Culture has spared no expense with the Fat Bustard II’s internal circuitry, which is the core of its spectacular sonic sheen. It uses a pair of 5965 valves for summing and incorporates a pair of 6SN7 valves at the output stage. In tandem, these two incorporations allow for optimal headroom and a characteristically smooth response.

Fat Bustard II Features

  • 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
  • Input impedance: 10kΩ (dependent upon channel and setting), unbalanced
  • Output impedance: 600Ω unbalanced
  • Monitor: 5kΩ unbalanced
  • Gain (ch. 1-8): 0 at Attitude 1, +11dB at max attitude
  • Maximum Output level: +25dBU
  • Distortion: (at Attitude 1) 0.015% +8dBm output, (at Attitude 3) 0.25%, (at max. attitude) ≥1% (dependent on how hard valves are driven)
  • Signal to noise (IEC weighted): at least 100dB below MOL at Att.1
  • Freq. response (±1dB): 16Hz to 40kHz (at Attitude 1)
  • Max bass lift: +10dB @ 50Hz
  • Max top lift: +12db @ 12kHz
  • Phase shift (10kHz) with EQ flat: (at Att.1), 7% (26°), (at Att. 4), 10% (36°)
  • Crosstalk (average at Att. 1 & 2): 59dB @ 1kHz, 44dB @ 10kHz. Crosstalk will increase at high attitude settings and when stereo spread and/or bass to centre controls are used
Thermionic Culture Fat Bustard II Summing Mixer (Unbalanced) Reviews