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Yet Another Adcom GFA-565 Thread
Yet Another Adcom GFA-565 Thread
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Old 7th December 2018, 02:24 AM   #331
cogeniac is offline cogeniac  United States
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Hi Guys!

Been a while! I have just been incredibly busy with work for he past year, and have not had anytime to finish off my replacement boards. I see Phloodpants did that for me! Good job!

When I stopped working on these, I had rehabbed the replacement board to adjust a couple of component positions. The board worked great.

I plan to get back to this after the new year. I'll build up a few of the new boards and then wring out the amps (I have SIX of them...). I'll be selling three at some point, after I assemble my system.

Just bought a set of Magnepan.7s to use these amps with.

Cheers,

Scott
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Old 7th December 2018, 02:33 AM   #332
anatech is offline anatech  Canada
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Yet Another Adcom GFA-565 Thread
Hi Scott,
That's really great to hear. Yes I remember you had a bunch of them. Please let me know when you have completed your board design.

Best regards, Chris
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Old 7th December 2018, 02:47 AM   #333
cogeniac is offline cogeniac  United States
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Hi Chris;

The board design is done. I built one up, and it worked great, but there was a slight issue with the position of one the of the heat sink pins and some other component placement that I can't recall today. I revised the layout very slightly to fix those issues, and fabbed several boards. And then I got super busy! I can't believe it's been almost 2 years since I posted here last!! Wow, time flies!

I'll try to get back to this in January, and will post details.

I still have the HP distortion meter, but it is pretty slow to use. After I refresh all of the amps, I may rent a modern analyzer and run data on all of the amps. Then I can sell the three with some level of confidence in their performance.

Let me know if you want a board. :-)

I was reminded this thread today when I bought my new Maggies. I mentioned that I was driving them with 565's and the guy mentioned that he thought that Nelson Pass had designed that amp. I am not sure about that. He posted on a 555 thread and said he designed that one.

I must say that figuring out exactly how the 565 worked, I was really impressed with the design. Pure power amplifier..

Scott
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Old 7th December 2018, 03:05 AM   #334
anatech is offline anatech  Canada
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Yet Another Adcom GFA-565 Thread
Hi Scott,
Quote:
I must say that figuring out exactly how the 565 worked, I was really impressed with the design. Pure power amplifier.
Yes. That is one thing that holds an interest for me after all these years. That's the fun part. I guess you know how the peak lights work now.

-Chris
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