Introducing the Hoppe’s Brain Adcom GFA-555 soft-start power supply

Exciting news! Hoppe’s Brain power supply boards for the GFA-555 are here!

Hoppe’s Brain GFA-555 power supply installed in GFA-555 MK1. Compact layout allows the toroidal power transformer to be moved to the right side of the chassis, where it induces less hum, buzz and noise into the amp’s circuitry.

These boards feature a number of improvements over the stock arrangement:

  • Soft-start circuit reduces stress on components like switches and capacitors.
  • Reduced hum, buzz and noise from the amplifier’s speaker outputs.
  • Capacitance upgrade from 4×15,000uF to 4×22,000uF.
  • Earth-loop breaker with diode clamp safety shunt.
  • Surge protection MOV
  • Snubber capacitors across AC side of bridge rectifiers
  • Compact layout. Overall wiring and clutter reduced.

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