Thrax Audio Spartacus 300B

Rumen Artarski, the designer and owner of Thrax Audio, explains the design and magic behind the Thrax Audio Spartacus 300b, 50W triode Class A mono-tube amplifiers. Via Hi-End By Oz


  • Custom current production tubes for long life
  • 50W for ample power reserves
  • Low noise for subtle dynamics
  • Auto bias for compensation of tube ageing and correct operation of any 300B
  • Current sourced 300B Shunt regulator for stable power allowing explosive dynamics and transparency even on the hardest loads
  • Transformer input and output for galvanic isolation
  • Microprocessor controlled operation for safety
  • Special filament heating circuit for harmonic richness and tube protection
  • Highest quality torque binding posts protecting your cables