Adcom GFA 555II

I am the original owner of this amp. I have had an audiophile restoration performed on this amp in 2017 by Hoppes Brain, who specializes in refurbishing Adcom equipment. Very low hours on amp. If interested I have two other amps that were refurbished as well if you like a mono block arrangement. ( Update...Sold one. I have one left)

• Rated Power Output. 200 watts per channel into 8 Ω from 20 - 20,000 Hz at less than 0.04% THD, both channels driven.
• Bridged Power Output 600 watts per channel.
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  Amplifier is converted to three-prong appliances with properly safety earth-grounded chassis. A heavier gauge 3-conductor power cord with heavy-duty plug is hard-wired in. An earth-loop breaker is installed between star ground and chassis for low noise.
  
  Models GFA- 555II are fitted with Hoppe’s Brain power supply circuit boards. These boards actually improve the amp’s noise performance.
  
  Circuit improvements include hand-matched transistor pairs for the differential input, hand-matched feedback network resistors, signal capacitor upgrades to polypropylene and other premium types, installation of local power supply bypass capacitors, installation of heatsinks on hot-running parts, replacement of certain transistors and diodes, and addressing all known reliability issues. All solder joints are inspected and/or touched up.
  
  Audiophile upgrade packages for the GFA-555 II feature newly designed power supply circuit boards with many improvements over stock and background noise and hum are reduced significantly by the new power supply board.