Decided on Gibson GA 20 need layout drawings etc.

scottahicks · 3rd November 2010, 05:24 AM

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.

costis_n · 3rd November 2010, 08:33 AM

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!

revintage · 3rd November 2010, 09:52 AM

Could maybe open my GA-20 when I get it back.

Ian444 · 3rd November 2010, 11:27 AM

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

scottahicks · 3rd November 2010, 07:05 PM

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.

scottahicks · 09:32 PM

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.

TechnoBeaver · 4th November 2010, 02:35 AM

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"

scottahicks · 4th November 2010, 08:56 PM

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

3rd November 2010, 05:24 AM	#1
scottahicks diyAudio Member Join Date: Nov 2010 Location: Grants Pass, Oregon	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.

3rd November 2010, 09:52 AM	#3
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Could maybe open my GA-20 when I get it back. __________________ Brgds Lars

3rd November 2010, 09:27 PM	#6
scottahicks diyAudio Member 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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3rd November 2010, 08:33 AM	#2
costis_n Tinkerer diyAudio Member 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!

3rd November 2010, 11:27 AM	#4
Ian444 diyAudio Member 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

3rd November 2010, 07:05 PM	#5
scottahicks diyAudio Member 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.

4th November 2010, 02:35 AM	#7
TechnoBeaver diyAudio Member 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"

4th November 2010, 08:56 PM	#8
scottahicks diyAudio Member 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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