Marble harpmaster

Harmonica Co Ref: 2013

• Initially based on 1959 Fender Tweed Bassman circuitry with several modifications added.
  
• Later Marble redesigned the Harpmaster to be dedicated for harmonica or bluesharp amplification only.
  
• The circuitry in the different stages of the amp is tuned to the specific frequency characteristics of harp with several classic microphone combinations.
  
• Recently Marble decided to lift their topmodel to an even higher level by redesigning the preamp to improve versatility and handling and adding Anti Feedback Circuitry to the power-amp.
  
• Marble have modified the input section to be able to accept both bullet mics as well as low-Z microphones.
  
• Also an input tone control is added to the input section to be able to pre-shape the tonal qualities of different microphones.
  
• The equalisation stage operates like in a tweed bassman with the conventional treble, middle and bass controls.
  
• The mastervolume controls the amount of signal that passes to the ouputstage.
  
• The presence control offers an extra "bassman59" dimension, boosting the uppermid and higher frequencies while generating more drive.
  
• At the output stage the Anti Feedback Control helps phasing out any feedback that would be experienced at higher volumes.
  
• The harpmaster combines excellent tonal response and low microphonic feedback even at higher volumes.
  
• 4 WEBER 10" Alnicos (2x 10A125, 2x 10A125O).