Adcom GFA-565 replacement boards Revision 2!

Even better! I made a few revisions to the original boards, and I can now say that these are better quality boards than the originals! These have plated through-holes for a more solid solder connection, and greater pad strength. They are also less affected by heat cycling. Even with poor soldering, a plated through-hole is extremely reliable.

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Continue reading Adcom GFA-565 replacement boards Revision 2!

Adcom GCA-510, Minimalist integrated amp made even more minimalist

How many inputs do you really need? For my second system, at my workbench, I really only need one, and that’s to listen to whatever is playing on the main system.

Few people have heard of this product, but for a short time, Adcom made a great little 50WPC integrated amp called the GCA-510. (Good Control Amp ,where’s the F?) It was essentially a GFA-535 with a smaller, lower-voltage power supply, and a passive preamp built in. Apparently, Adcom was going after the UK market, land of small but high-quality integrated amps. (More people sharing walls with neighbors, and we Yanks are so rude with our big amp stacks.)

Listening, Recording and balance controls have been replaced with hole plugs. An ugly volume knob from the parts bin completes the look.
Listening, Recording and balance controls have been replaced with hole plugs. An ugly volume knob from the parts bin completes the look.

Continue reading Adcom GCA-510, Minimalist integrated amp made even more minimalist

A custom GFA-545 II with an insane power supply

Here’s an awesome amp I just finished for a customer in NYC. This was really fun to build! He wanted a high-current version of the GFA-545, so we went all-out with dual Avel 500VA transformers, gigantic 27,000uF filter caps, and a truly dual-mono layout throughout. This amp has dual power cords, fuses and power switches.

The sound is just incredible! Perhaps the best one yet. Super clean and powerful, and never seems runs out of gas, right up to clipping. I’d say it has an effortless sound to it. I measured 162W at 8 ohm and 272 at 4 ohm just before clipping! That’s only 50W short of a perfect doubling of power at half impedance. That is one stiff power supply!

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Continue reading A custom GFA-545 II with an insane power supply

Sold! ADCOM GFA-535 Fully restored and in mint condition

Update: SOLD

Folks, here’s another ADCOM GFA-535 II for sale! This one is in MINT condition. Not a scratch on it, and I’ve installed a freshly powder-coated top cover! It’s gorgeous. If you love the Adcom GFA-535, this is the one for you.

As with all the amps I sell, this unit has been completely torn down, rebuilt, refurbished, and obsessed over. This amp not only sounds better than new, but I intend it to last another 30 years or more! I go way beyond  a simple re-cap. Any and all parts that may potentially deteriorate have been replaced, and I’ve paid a lot more attention to detail than the factory with things like wiring and matching components. Every component is checked, and every solder joint shines.

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And this one has a little special something. A powder coated top cover! (I got a deal on getting a bunch of covers done.)

Continue reading Sold! ADCOM GFA-535 Fully restored and in mint condition

Sold: Fully Restored ADCOM GFA-555 II $820

Hey folks, I have another 555 II ready for a new home! It’s got the full package. All new capacitors throughout, including the power supply caps. Matched input transistors, local supply bypasses, etc etc etc.

This one is in excellent cosmetic condition. There are a couple of dings that I have touched up, and are hardly noticeable, but since the amp is not totally “mint”, I am selling it for $820 instead of the usual $850. (I am very picky about this stuff.) Please click on the hi-res photos to see for yourself.

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A beautiful face. There is a small ding in the middle of the right side. It’s been touched up and is hard to see, but this is why I am taking $30 off the price.

Continue reading Sold: Fully Restored ADCOM GFA-555 II $820

Sold: ADCOM GFA-535 II fully modded

Hi Folks, I have another ADCOM GFA-535 II for sale! As with all the amps I sell, this unit has been completely torn down, rebuilt, refurbished, and obsessed over. This amp not only sounds better than new, but I intend it to last another 30 years or more! I go way beyond  a simple re-cap. Any and all parts that may potentially deteriorate have been replaced, and I’ve paid a lot more attention to detail than the factory with things like wiring and matching components.

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And this one has a little special something. A powder coated top cover! (I got a deal on getting a bunch of covers done.)

Continue reading Sold: ADCOM GFA-535 II fully modded

Amps on the way: Adcom GFA-555 II and GFA-535 II

Hey folks, I haven’t had any amps for sale for a while. I’ve been super busy with restorations for people… But these two are nearly ready for adoption! Both are in like new condition cosmetically, and have been given the full restoration and upgrade. All caps are new, including the big cans in the power supply.

GFA-555 II. All the boards are done, new binding posts, zobel filters, power cord, transformer wiring, installed input board local supply bypasses, matching input transistors, etc. I just need to mount those caps on the chassis, install the big copper bus-bar and wire it all up. (Then torture testing, bias tweaking and listening tests.)

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Continue reading Amps on the way: Adcom GFA-555 II and GFA-535 II

Sold: Gorgeous GFA-545 II

Sold to Maxim in NYC!

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And the amps just keep on rolling! This is the nicest GFA-545 II I’ve ever restored. Cosmetically, It’s pretty close to perfect! The face is nearly flawless. There’s just one scratch that I’ve touched-up on the top cover, towards the back, and a two barely noticeable scuffs on the sides. Click on the photos to see it in hi-res. Overall, it looks just about brand new.

But it’s better than brand new! This is a complete tear-down and restoration using every trick I’ve learned about Adcom amplifiers.

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GFA-545 II Restored

Continue reading Sold: Gorgeous GFA-545 II

Sold! Beautiful ADCOM GFA-555 II with all the mods – $850

UPDATE: Sold to David in BC.


Folks, this is the nicest GFA-555 II I’ve ever restored. What a beauty! The previous owner was a cellist for the Milwaukee Symphony Orchestra, who took excellent care of it. Cosmetically, it’s about as close to mint condition as they come. There are a few small ticks in the finish here and there, which I’ve touched-up, and are hard to notice, and the face is totally perfect! Click on the photos to see it in high-resolution.

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Since this one is so nice, I pulled out all the stops and installed every enhancement I know for Adcom amps.

Continue reading Sold! Beautiful ADCOM GFA-555 II with all the mods – $850