m679 / Tube Synth Module


m679 High Voltage Analog Tube Synth / Bypass Overdrive FX




Building upon the legacy of the m676 Fury the M series 679 Gran Fury has 8 times the patches, 150% more oscillating power, 120% more cv inputs & adds a synth bypass mode to double as a filthy tube distortion unit—all up in your tightly packed rack— ALL WITHIN the same 14hp as before. The new m/679 v4 will run from rack’s power supply OR using an optional Auxiliary Power Supply to leave the full capacity of your modular supply unotuched. The sound? Curiously akin to R. Lee Ermey switching on the kilowatt floods & screaming through an Orange Full-stack set to “11” first thing the morning after an all-night gin bender; i.e. relentless punishment applied to all head-holes within audio range. Gran Fury’s feature list picks up where the renown Fury’s left off:

  • All Analog Circuit
  • Audio Input for synth Modulation 
  • Oscillator Bypass Setting for use as Tube Distortion FX
  • 3 Main-Oscillators with Vactrol CV inputs
  • 4 Amplifier Stages: 2 Solid State + 2 High Voltage Tube
  • 2 Unique Vactrol CV FX parameters (Drive & Modulation)
  • 1 Master Frequency Control of Oscillators: Track
  • 6 CV Input Attenuators
  • m679’s 5 Toggles = 8x More Internal Patch Combinations than Original m676
  • Amplifier Boost / Synth-Bypass Switch 
  • Compatible w/ Alternate Tubes for Auxiliary Plug & Play Sonic Profiles 
  • m/679 v4 runs using your Modular Rack supply
  • OR Optional Aux. Supply uses ZERO mA of Your Rack’s Existing Power Supply
  • Psvane RCS Max. Gain, Twin-Triode Vacuum Tube run at High Voltage

Gran Fury m/679 is multi-purposed:

  1. Analog signal source displaying spectral harmonics unique to tube synthesis.
  2. Modulating / Filtering / Mutating FX for signal-through or side-chain patches.
  3. Tube Overdrive Effect Setting silences all but Tube Circuit for OD FX 

Like any Trogotronic worth its salt the m/679 Gran Fury’s functions are not conservative; While there are 3 Oscillators, other parts of the circuit can command more complicated frequencies in an intuitive manner. Similarly the Oscillators themselves may be applied as filters / modulators serving to broaden the utility of the instrument even more so. Add to this the inclusion of 6 CV inputs compatible with sequencers, envelopes etc. plus distortion mode & suddenly your vanilla rack is moonlighting as a cruel mistress at that deviant dungeon downtown wearing earplugs so as never to hear the whimpered safe words: “Gran Fury!”

Audio Samples:  


  • Euro-Format
  • 14HP
  • Depth = 2 1/16” (53mm)
  • +12v rail Startup peak current 560mA; avg. 260mA (0mA w/optional Aux. Supply)
  • 12vDC Aux. Power Supply: Optional


All Trogotronic instruments come complete with pretty much everything needed to “plug & play”. Still, herein are replacement parts should ever something go missing (plus a few extra options should ever such a fancy strike).