A Tour of a Hoppe’s Brain Adcom GFA-585 Restoration

Hi everyone,

This is perhaps the nicest amplifier I’ve ever restored! A GFA-585; The first of its kind with newly designed replacement input boards. (To fix the infamous leaking capacitor issue.) And I can’t believe I’m saying this, but…

It’s for sale. $1800. Update: SOLD to previous customer, Bill.

Also, I wanted to share what I know about restoring a GFA-585. I hope this is useful to others who are tweaking their GFA-585’s, or installing a set of my replacement circuit boards.

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Continue reading A Tour of a Hoppe’s Brain Adcom GFA-585 Restoration

New, improved GFA-565 circuit boards! Now available fully assembled and tested.

Hi everyone,

Long time, no blog! I’ve been super busy with Adcom amp and preamp refurbishings, and obsessing over new circuit board designs.

Here are completely new versions of the GFA-565 input boards, and for the first time, I am offering fully assembled and tested boards for $380. (Please allow up to a 15-day lead time. They are hand-made, by me in my shop.) Click here to buy.

Continue reading New, improved GFA-565 circuit boards! Now available fully assembled and tested.

Hoppe’s Shoppe is online!

Hi Everyone, my store is finally online!

Hoppe’s Brain Shoppe

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I have just three products up there right now, but there are more to come.

Coming soon: (These items are all available by request, just not yet in the store.)

  • GFA-535 MK1 Power Supply board
  • GFA-535 MK2 Power Supply board
  • GFA-545 MK1/MK2 Power Supply board
  • Unbalanced stereo line driver. One stereo input, four stereo outputs, buffered and driven by OPA2134 op-amps. (For running long unbalanced patch cords, or adding buffered tape outputs to a preamp, among other uses.)
  • Bipolar audio power supply, +/-15V. Super low noise, low impedance and high speed. Based on TI LP38798.

Thanks to all my customers for the continued success of Hoppe’s Brain. I am so happy to be doing this for a living.

Hoppe’s Brain is full! Declaring a hiatus on new repairs and refurbishings.

Hi Everyone,

Hoppe’s Brain is thriving, but demand for my services has been overwhelming! My waiting list has grown to more than a year, so I’m sorry, but I must declare a temporary hiatus on accepting new clients for repairs and refurbishings.

I need concentrate on my existing customers. Thanks for understanding.

I still sell circuit boards and kits, and this area of Hoppe’s Brain will continue to expand. Look for my store to go online in the next few weeks. In the meantime, contact me with the form below and let me know what you want. (Power supply boards for GFA-535, 545 and GFA-555 amplifiers, GFA-565 input boards, etc.)

If you’ve emailed me and not heard back, I will get back to you within the next few weeks.

Thanks to my awesome customers for making Hoppe’s Brain a success!

Chris

A tour of a Hoppe’s Brain GFA-555 restoration

Hi everyone! One of my customers sent me a particularly nice GFA-555 MKI to be refurbished. It’s never been tampered with, and has very few scratches on the case… just beautiful. So I thought I would take lots of pictures along the way as I refurbish it, and show you the latest iteration of my GFA-555 rebuild process. This is the full monty upgrade package including the Hoppe’s Brain soft-start power supply board, with all sound quality and reliability improvements. $1025 in total.

Adcom GFA-555 Amp, being all amp-ey.

Continue reading A tour of a Hoppe’s Brain GFA-555 restoration

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!

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These boards feature a number of improvements over the stock arrangement with the old-style chassis-mount components:

  • 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 4×27,000uF. Nearly double!
  • Earth-loop breaker with diode clamp safety shunt.
  • Amp is converted to a 3-wire, earth-grounded chassis appliance, for safety and better noise rejection.
  • Surge protection MOV
  • Snubber capacitors across AC side of bridge rectifiers
  • Compact layout. Overall wiring lengths reduced, fewer mechanical connections, and a much cleaner internal layout.

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

How I clean Adcom GFP-555 and GFP-565 record and playback selector switches

Hey folks, I hope this will be useful to anyone attempting to clean an ALPS sliding listen/record selector switch like those used in the Adcom GFP-555 and GFP-565. These are common in many brands of preamps and receivers.

Ribbon slider-switch inside GFP-555.

Continue reading How I clean Adcom GFP-555 and GFP-565 record and playback selector switches