Thermionic Culture Fat Bustard II 12 Channel Summing Mixer + EQ

The Thermionic Culture Fat Bustard II is a one-of-a-kind tube summing mixer that brings warmth, punch, and depth to your mix like nothing else can. Whether you’re producing rock, jazz, hip hop, or cinematic scores, the Fat Bustard II adds life and flavor that’s hard to describe but easy to hear. If you're chasing that rich, analog feel in the box, this is your secret weapon.

Thermionic Culture Fat Bustard II 12 Channel Summing Mixer + EQ Review

Built around carefully chosen vacuum tubes, the Fat Bustard II blends 12 channels into one beautiful stereo mix with amazing clarity and headroom. The mixer also gives you hands-on tone-shaping with its unique Varislope EQ, stereo width control, and the ever-popular “Attitude” knob, which lets you dial in the right amount of harmonic grit. With a pair of 5965 valves handling summing duties and 6SN7s in the output stage, it delivers that signature Thermionic Culture sound—silky, detailed, and musical. The TX version adds balanced outputs, perfect for pro studios looking for cleaner integration.

What's the Difference Between the Fat Bustard II and Fat Bustard II TX?

The main difference between the Fat Bustard II and the Fat Bustard II TX lies in their output connections. The standard Fat Bustard II features unbalanced outputs, chosen specifically for their warmer, more musical tone. On the other hand, the Fat Bustard II TX includes balanced outputs, which offer a cleaner signal path and better noise rejection—especially useful in larger or more complex studio setups. Both versions deliver the same rich, tube-driven sound and hands-on mix control, but the TX is better suited for engineers who want that analog tone with modern studio connectivity.

Thermionic Culture Fat Bustard II 12 Channel Summing Mixer + EQ Features

• Shape your mix with smooth-sounding bass and treble controls
• Add character with a knob that boosts harmonics in just the right way
• Make your mix wider or more focused with stereo width tools
• Push bass to the center or sum the whole mix to mono if needed
• Control your monitor volume directly from the unit
• Easy-to-use pan knobs on four channels let you place sounds where you want

Thermionic Culture Fat Bustard II 12 Channel Summing Mixer + EQ Specs

• Uses 5965 and 6SN7 vacuum tubes for summing and output
• 14 inputs total (4 stereo pairs, 4 mono with pan, 2 aux with pan switch)
• All-valve passive input summing mixer with point-to-point hand wiring
• ELMA 31-position rotary switch for main level control
• Balanced outputs on TX version for low-noise studio setups
• Frequency response reaches below 20 Hz and above 20 kHz

*This product may have a lead time of up to 2 weeks. If you'd like an exact shipping time, please contact us ahead of time.*