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JDJ
09-06-2010, 11:42 AM
I'm thinking about building an amp, but I can't find an aftermarket chassis that fits it. I thought about building one out of wood and using brass plates here and there for grounding. What do you think? Anybody try it? I suppose that I would loose the shielding that a metal box provides.

wizard333
09-06-2010, 12:08 PM
You'd lose the shielding for sure, and I'd be concerned that if something lifts/breaks, there wont be a ground reference. Some people also claim that the eddy currents caused by a metal chasis contribute to the sound of an amp.

JDJ
09-06-2010, 12:41 PM
Just thinking outside of the box... :D

I could coat the inside with that conductive paint. And/or some copper foil. What do you think of that?

SatelliteAmps
09-06-2010, 01:00 PM
You can build it on a wood chassis if you have to. Some chassis don't shield very well anyways. Grounding will be a concern, but it can be dealt with. I wouldn't bother with copper foil or shielded paint. If it was me, I would use a large brass plate behind the controls to act as a grounding bus for them. For the tube sockets & transformers), I would probably use a piece of plate metal (aluminum or steel) and cut it to size, then punch holes and mount it on top of the wood chassis. I would then use a large wire to connect the two together so they are one common grounded plane. Use wood for the rest.

JDJ
09-06-2010, 01:38 PM
You can build it on a wood chassis if you have to. Some chassis don't shield very well anyways. Grounding will be a concern, but it can be dealt with. I wouldn't bother with copper foil or shielded paint. If it was me, I would use a large brass plate behind the controls to act as a grounding bus for them. For the tube sockets & transformers), I would probably use a piece of plate metal (aluminum or steel) and cut it to size, then punch holes and mount it on top of the wood chassis. I would then use a large wire to connect the two together so they are one common grounded plane. Use wood for the rest.

Cool... thanks for the input. :)

Dana-L
09-06-2010, 01:46 PM
From an old radio handbook:

http://mysite.ncnetwork.net/res8lp0u/RAHandbook-02.jpg

JDJ
09-06-2010, 02:08 PM
I like that wooden chassis!

BTW, anybody know a good source for Allen-Bradley NOS resistors... I need about 29 of them. Thanks! :)

VanR
09-06-2010, 03:06 PM
I like that wooden chassis!

BTW, anybody know a good source for Allen-Bradley NOS resistors... I need about 29 of them. Thanks! :)

http://angela.com/noscarboncomptypesbyallen-bradleystackpoleandothers.aspx

Trout
09-06-2010, 03:35 PM
Look up old 1920's antique radios like Atwater Kent. The used wood chassis, and actually had leads carved/routed into the bottom side to prevent them from flopping around.

Of course they had really cool bakelite tube socket and coil assemblies.

http://www.antique-radios.net/vrps03/7a.jpg

http://www.antique-radios.net/radpix/ak/ak434ft.jpg

http://www.thisoldradio.com/images/ak10a/bottom.jpg

TweeDLX
09-06-2010, 03:47 PM
Way cool pics Trout!!! Thanks for sharing them.

Mike

aleclee
09-06-2010, 03:54 PM
Use a cake pan.

Trout
09-06-2010, 07:47 PM
Use a cake pan.

+1

Ikea has some REALLY cool looking cake pans, seamless aluminum with nice tight radius.
I have seen a lot of guys do that with excellent results.

jbefumo
11-01-2012, 12:18 AM
I've been considering having a chassis bent out of 12-gauge sheet brass -- mainly for aesthetic considerations. Any contraindications?

VacuumVoodoo
11-01-2012, 06:10 AM
Cooking pots work just as well.

http://i26.photobucket.com/albums/c149/VacuumVoodoo/Planket/pot_amp.jpg

'58Bassman
11-01-2012, 07:32 AM
Look up old 1920's antique radios like Atwater Kent. The used wood chassis, and actually had leads carved/routed into the bottom side to prevent them from flopping around.

Of course they had really cool bakelite tube socket and coil assemblies.

http://www.antique-radios.net/vrps03/7a.jpg

http://www.antique-radios.net/radpix/ak/ak434ft.jpg

http://www.thisoldradio.com/images/ak10a/bottom.jpg

Now THAT'S what's known as a 'table-top radio'!

Keyser Soze
11-01-2012, 09:58 AM
Look up old 1920's antique radios like Atwater Kent. The used wood chassis, and actually had leads carved/routed into the bottom side to prevent them from flopping around.

Of course they had really cool bakelite tube socket and coil assemblies.

http://www.antique-radios.net/vrps03/7a.jpg

http://www.antique-radios.net/radpix/ak/ak434ft.jpg

http://www.thisoldradio.com/images/ak10a/bottom.jpg

That second one would look awesome atop a full stack of 4x12"s

Aleksanders, not so much...;)

guitarcapo
11-01-2012, 12:39 PM
heat is your enemy

teemuk
11-01-2012, 12:44 PM
Now THAT'S what's known as a 'table-top radio'!
Or "breadboard".

phsyconoodler
11-01-2012, 02:15 PM
I'm thinking about building an amp, but I can't find an aftermarket chassis that fits it

Or get an aluminum chassis made to your specs.There are lots of places that make chassis.
www.turretboards.com and many others.

Baxtercat
11-01-2012, 02:40 PM
Cake pans, tool boxes...
http://www.tdpri.com/forum/attachments/amp-central-station/114683d1329674010-craftsman-toolbox-valve-amp-craftsman-toolboxamp-jpg

SamBooka
11-01-2012, 03:10 PM
Cake pans, tool boxes...
http://www.tdpri.com/forum/attachments/amp-central-station/114683d1329674010-craftsman-toolbox-valve-amp-craftsman-toolboxamp-jpg

Arent you worried about your screwdivers shorting something out.?

zzmoore
11-01-2012, 08:07 PM
I'm thinking about building an amp, but I can't find an aftermarket chassis that fits it. I thought about building one out of wood and using brass plates here and there for grounding. What do you think? Anybody try it? I suppose that I would loose the shielding that a metal box provides.
What amp are you building.?

Rod
11-01-2012, 08:38 PM
Great stuff guys... thanks

JDJ
11-22-2012, 06:34 PM
By zzmoore:

What amp are you building.?

Actually, I already built it. This is an older thread I started more than two years ago. Here's the amp:

http://i84.photobucket.com/albums/k36/j616129/Brown%20Deluxe%206G3/DSC06830.jpg

And here's the wooden chassis:

http://i84.photobucket.com/albums/k36/j616129/Brown%20Deluxe%206G3/DSC06401.jpg

And here's the build thread:

http://www.thegearpage.net/board/showthread.php?t=778411

Two years later and it's still playing strong. :)

guitarcapo
11-23-2012, 03:56 AM
Just keep heat in mind off the tubes, of course.

Baxtercat
11-23-2012, 07:53 PM
Love it.
http://i84.photobucket.com/albums/k36/j616129/Brown%20Deluxe%206G3/DSC06401.jpg