Decided on Gibson GA 20 need layout drawings etc. Decided on Gibson GA 20 need layout drawings etc. - diyAudio
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Decided on Gibson GA 20 need layout drawings etc.
Decided on Gibson GA 20 need layout drawings etc.
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Old 3rd November 2010, 05:24 AM   #1
scottahicks is offline scottahicks  United States
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Join Date: Nov 2010
Location: Grants Pass, Oregon
Default Decided on Gibson GA 20 need layout drawings etc.

With the help of others here on the forum I have decided to build a 1951 Gibson GA 20.

This is my first tube amp build, but not my first rodeo in electronics or fabrication. So I know I will need a little hand holding if anyone is willing but hopefully I can produce a very well documented build that will benefit anyone else wanting to do the same.

I guess the first place I should start is the Chassis. Does anyone have a layout drawing for the Chassis? Blueprints for the cabinet? anything? anyone? Bueller... Bueller...

All ideas, suggestions, pointers, etc. would be great I look forward to it.
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Old 3rd November 2010, 08:33 AM   #2
costis_n is offline costis_n  Greece
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Join Date: Aug 2008
Sakuma San said: I place the components on the chassis, I leave it on the dining table and i look at it for a few days. Then the optimum layout presents itself. Or something to that effect. It works, really!
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Old 3rd November 2010, 09:52 AM   #3
revintage is offline revintage
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Join Date: May 2007
Could maybe open my GA-20 when I get it back.
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Old 3rd November 2010, 11:27 AM   #4
Ian444 is offline Ian444  Australia
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Join Date: Nov 2008
Location: Brisbane QLD
A Google images search pulls up some real usefull pics on the first page. Give that a go.

e.g. http://www.ovationfanclub.com/photos...6889_ga20b.jpg
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Old 3rd November 2010, 07:05 PM   #5
scottahicks is offline scottahicks  United States
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Join Date: Nov 2010
Location: Grants Pass, Oregon
The reason I was hoping for a layout schematic is that I am in a manufacturing / engineering program in college, If I can get a layout schematic I can turn it into a CAD schematic and cut it on a plasma table or in the cnc mill, I could even etch the original labeling into the surfaces.
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Old 3rd November 2010, 09:27 PM   #6
scottahicks is offline scottahicks  United States
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Join Date: Nov 2010
Location: Grants Pass, Oregon
http://s45.photobucket.com/albums/f6...t=10f33983.pbw

So here is a link to a slideshow of all the glory of the thriftstore find before being torn apart to rise again.

Last edited by scottahicks; 3rd November 2010 at 09:32 PM.
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Old 4th November 2010, 02:35 AM   #7
TechnoBeaver is offline TechnoBeaver  Canada
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Join Date: Apr 2010
Location: Ontario
Nice parts. I to have been trolling the flea markets. Finally made myself a nice tube amp.

Good luck with your project.

"Most useless post ever"
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Old 4th November 2010, 08:56 PM   #8
scottahicks is offline scottahicks  United States
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Join Date: Nov 2010
Location: Grants Pass, Oregon
I started the teardown and got through the majority of the desoldering. Next comes the drilling out of all the rivets on all the tube mounts and removing the transformers.

Here is the link to the photo slideshow of the teardown

The Teardown :: The Teardown slideshow by scottahicks - Photobucket
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