Bridgeable High Current Power Amplifier


The classic award winning amplifier design of the original GFA-555mkII has been reborn. The Adcom GFA-555 represents the most advanced thinking in audio amplifier design. It offers exceptional value and superior performance at a reasonable price. 

GFA-555se power amplifier represents the pinnacle of ADCOM’s audio engineering. This Nelson Pass design broke ground when it came out in the 80’s, getting rave reviews and providing tank-like reliability at a decent price. That these amplifiers are much in demand after so much time is strong testament to their value and durability.

We have worked long and hard to ensure that the GFA-555se improves upon it’s original eminent version in key areas, delivering even better performance. Externally, the chassis footprint and front panel design are identical to the original. Internally, all circuitry has been upgraded to meet ETL/ETLc, FCC, LVD and CE/EMC requirements using UL approved FR-4 printed circuit boards. High performance component selections include ultra low ESR electrolytic capacitors. The result of these improvements is lower distortion, better dynamic range, improved damping factor and greater stability and separation of individual instruments on the sound stage.

  • 200 watts per channel, 8 ohms      
  • 300 watts per channel, 4 ohms
  • 600 watts, 8 ohms BRIDGED   
  • Balanced and Single-Ended Inputs
  • 16 discrete output transistors
  • Custom 700 watt toroidal transformer
  • 60,000uF total storage capacitance
  • Ultra-Stable Bias Circuitry
  • Direct-Coupled Input & Output Circuitry
  • No Current Limiting
  • No Output Inductor
  • 120 VAC  50/60 Hz

Max Dimensions: 7 1/4" x 17" x 14 3/16"
Warranty: 2 yr. limited manufacturer

"Charles Lloyd’s newest is Mirror...background is jet black...sax, bass and piano floated out of my Daedalus speakers on the opening track and I didn’t look back or take any other notes. I just listened." 

   - Secrets, Rick Schmidt

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SHIPPING: The shipping weight of the GFA-555se is 40 lbs. Shipment by FEDEX Home Delivery/Insured is FREE if your delivery addresses is within the 48 continental states. If your delivery address is in Alaska, Hawaii, Canada or other location outside of the USA, please call (480-607-2277) or email to determine the shipping cost and to place your order.  Duties, taxes and fees on shipments to destinations outside of the USA are NOT included in the price.