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Month: April 2019

New Adcom GFA-555 MK1 Input boards!

Posted on April 26, 2019 by hoppesbrain

By popular demand, I have created new input circuit boards for the GFA-555 MK1! These boards integrate all of the improvements I normally make when I refurbish a GFA-555.

Buy one here.

Continue reading New Adcom GFA-555 MK1 Input boards!

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* Not affiliated with ADCOM corporation, past or present.

Featured Products

  • BFA-555 Smart Soft-Start Power Supply for the Adcom GFA-555 $220.00 – $340.00
  • Adcom GFA-555 MK1 Input Board $80.00 – $360.00
  • Matched input transistors, 2 pairs KSC1845 $30.00
  • Hoppe's Brain Adcom GFA-535 MK1 Power Supply Board Adcom GFA-535 MK1 Power Supply Kit $140.00
  • Adcom GFA-565 Replacement Circuit Board $80.00 – $380.00

Recent Posts

  • New and improved power supply kits for the GFA-555!
  • Hoppe’s Brain is no longer accepting repair or refurbishing clients. Sorry! It’s only DIY Circuit Board Kits from now on.
  • Hoppe’s Brain Coronavirus Pandemic Statement.
  • New Product: “Capacitor Hats” for large screw-terminal electrolytic capacitors.
  • **SOLD** Pair of fully restored ADCOM GFA-565 Monoblock amplifiers $2600

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Recent Posts

  • New and improved power supply kits for the GFA-555!
  • Hoppe’s Brain is no longer accepting repair or refurbishing clients. Sorry! It’s only DIY Circuit Board Kits from now on.
  • Hoppe’s Brain Coronavirus Pandemic Statement.
  • New Product: “Capacitor Hats” for large screw-terminal electrolytic capacitors.
  • **SOLD** Pair of fully restored ADCOM GFA-565 Monoblock amplifiers $2600

Recent Comments

brettbashore on A Tour of a Hoppe’s Brai…
Frank Fisher on Hoppe’s Brain Coronaviru…
hoppesbrain on Yet another variation of the A…
Nelson Pass on Yet another variation of the A…
Edward Verlie on GFA-555 MK1 “VERTICAL…

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