Kit Ryan mod for Adcom GFA-555

Mayank · 12th October 2006, 07:00 PM

Hi All:

I was going through some old Audio Amateur magazines and came across a detailed article by Kit Ryan on building a Power Supply regulator for the Adcom GFA-555. According to the article, with this modification, "the transient response of the amplifier is dramatically improved, bringing increased resolution, imaging and sound stage definition with it. The best part is that these qualities are maintained from low volume levels right up to when the green 'overload' LEDs on the front panel light up".

This looks very attractive and I would like to start this project and modify my GFA-555.

2 questions - has anyone on the forum built this? Are the results of the modification really as described?

Thanks in advance
Mayank

anatech · 12th October 2006, 07:27 PM

Hi Mayank,
I'm not sure about that one. Regulating some of the parts in the voltage amp section should do it.

Adcom had an option for this, but I've never seen one installed. Try it, but make sure you can back out as well.

-Chris

12th October 2006, 07:00 PM	#1
Mayank diyAudio Member Join Date: Oct 2004 Location: Falls Church, VA	Kit Ryan mod for Adcom GFA-555 Hi All: I was going through some old Audio Amateur magazines and came across a detailed article by Kit Ryan on building a Power Supply regulator for the Adcom GFA-555. According to the article, with this modification, "the transient response of the amplifier is dramatically improved, bringing increased resolution, imaging and sound stage definition with it. The best part is that these qualities are maintained from low volume levels right up to when the green 'overload' LEDs on the front panel light up". This looks very attractive and I would like to start this project and modify my GFA-555. 2 questions - has anyone on the forum built this? Are the results of the modification really as described? Thanks in advance Mayank

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12th October 2006, 07:27 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Mayank, I'm not sure about that one. Regulating some of the parts in the voltage amp section should do it. Adcom had an option for this, but I've never seen one installed. Try it, but make sure you can back out as well. -Chris