"Just when I feel a good understanding of audio,
something like Gaincard comes along and destroys it."
Steven R. Rochlin
enjoythemusic.com

Features:

• World's smallest number of parts - 9 parts per channel ( excluding attenuators )
  
• World's shortest signal pass length - 32 mm ( including the length of parts )
  
• World's shortest NFB loop length - 9 mm ( including the length of the resistor )
  
• World's smallest filter/condenser - 1000µF, (50W version - 2200µF)
  
• Powerful voltage regulation with high capacity transformer - 170 VA cut-core transformer  +-individual coils
  
• Dual mono construction with each channel in a separate chassis.
  
• Rigid and compact aluminum chassis construction to release vibrations smoothly.
  
• Separate 12-position attenuators for each channel.
  
• Can be upgraded into a pair of complete mono amplifiers by adding another Model 4700 Power Humpty

Above: Model 4700 power supply unit