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DIY circuit board kits for Adcom and DIY Amplifiers

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Month: April 2019

New Adcom GFA-555 MK1 Input boards!

Posted on April 26, 2019January 17, 2022 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
  • Adcom GFA-535 MK1 Power Supply Kit $140.00
  • Adcom GFA-565 Replacement Circuit Board $80.00 – $380.00

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Recent Posts

  • Cool new product! ‘Add-A-Buffer’ adapter boards (Your op-amp + TI BUF634A in a DIP-8 socket)
  • Most built-and-tested boards now in stock!
  • New Product! Earth-Loop Breaker Boards
  • New policy at Hoppe’s Brain: I’m going to start actually billing for my time. :)
  • Parts shortages :(

Recent Comments

ROB M on Adcom GCA-510, Minimalist inte…
Andrew Bernbaum on New policy at Hoppe’s Br…
Win Rice on New policy at Hoppe’s Br…
John Coutcher on New policy at Hoppe’s Br…
JEFFREY A YOGURTIAN on New policy at Hoppe’s Br…

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