Fender twin reverb chassis dimensions - diyAudio
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Old 17th May 2012, 03:28 PM   #1
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Default Fender twin reverb chassis dimensions

Hey guys,
I'm planning on cloning Twin Reverb or something similar as a head, not combo, just wondering if anyone could give me rough dimensions of the timber outer chassis and the inner metal sub chassis. I'll probably get an Alu chassis from digikey.
Also, in models with the controls on the front (as opposed to on top), how is the metal chassis attached to the timber outer shell? It seems like if you have the chassis oriented so that one long side is at the front with the controls, and the other is at the back with power IEC connector etc, you can't then screw from inside the box into the timber.
This guy seems to use a timber clamp type of arrangement to press the chassis to the inside of the top. Anyone tell me how fender did it?
http://www.jeangodbout.com/princeton/cabinet7.jpg

Cheers
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Old 17th May 2012, 04:05 PM   #2
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Do you know about these guys? CeriaTone.Com - DIY Guitar Tube Amp
You could buy just a chassis from them and save yourself a lot of work.
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Old 17th May 2012, 04:11 PM   #3
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Yeah I've seen their site; I've got the tools for the metalwork involved and enjoy doing it so I think I'm going to DIY it. I'm more interested in getting the dimensions so I can use something similar to the original.
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Old 17th May 2012, 04:20 PM   #4
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OK - just offering the suggestion that Alu boxes at Digikey migh not be strong enough. Of course it depends of a number of things. For the current amp I'm using P-H1441-26 from Antique Electronic Supply but I digress. Good luck.
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Old 17th May 2012, 09:33 PM   #5
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That's an interesting site! But not much info. And their Fender clones do't get very large.

I'm looking for a kit to make a fender front-end, like just the preamps.
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Old 17th May 2012, 11:46 PM   #6
Simon B is offline Simon B  United Kingdom
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Quote:
Originally Posted by mnturner View Post
Hey guys,
I'm planning on cloning Twin Reverb..... in models with the controls on the front (as opposed to on top), how is the metal chassis attached to the timber outer shell?...Anyone tell me how fender did it?

Either side of the top of a Twin Reverb there's a thin metal strip. Each end of that has a countersunk hole in it. The strips act as long washers for bolts that go right down through holes in the chassis into nuts you put on the end of your finger to get onto the bolts. Sounds awful, but it's ok actually.

There are wooden strips screwed to the sides of the cab to slide the chassis in on til you get the bolts in. Pretty low tech, but works well.
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Old 18th May 2012, 12:30 AM   #7
MelB is offline MelB  Canada
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24 1/2" long 8 1/4" deep on the long side and 1 5/8" tall. Best gues without pulling it out. the 24 1/2" is accurate.
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Old 18th May 2012, 02:51 AM   #8
Enzo is offline Enzo  United States
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Even if you don;t care to buy from them, some of the sites that sell kits may have included information you can use.

Weber Speakers - Making the world a bit louder each day.

Mojotone.com - The Best source for Vintage Amp Parts, Cabinets, Guitar Parts, Bass Parts, and Pickup Parts

From Mojo, a Twin Reverb chassis as an example:
Mojo Chassis Blackface Twin Reverb Style Chassis
Blackface Twin Reverb® Style Cabinet - Mojotone.com
Blackface Twin Reverb® Style Head Cabinet - Mojotone.com
(dimensions are included under details in each case.)


Aluminum is fine for light stuff, but the transformners are pretty substantial on a Twin reverb, and I'd think steel the better choice.


If you are planning to build one of these things, and especially from scratch, but you don;t know basics like how the chassis is mounted, may I suggest getting your hands on a Fender amp or two just to inspect how they are put together.

Is there a professional amp repair shop convenient to you? You might ask the tech if he'd show you the basic interior of a Fender amp. Offer to pay him for his time.

Typical details to consider: Power transformer mounted float in a chassis hole, output transformer mounted on top of chassis vertically. Tube sockets and controls mounted directly on chassis, but most small components on eyelet board with flying leads to the above. Note how that is mounted. Note socket wiring, in particular the heater leads in twisted pair.
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Old 18th May 2012, 12:19 PM   #9
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FYI: Indeed there were, at least in the CBS Silverface aera, amp heads available using the same chassis as a Twin Reverb. They were sold as, e.g., Dual Showman Reverb. Here's the schematic. And here I've found some more information of, maybe, general interest on these Twin Reverbs.

Best regards!
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Old 18th May 2012, 12:58 PM   #10
MelB is offline MelB  Canada
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Quote:
Originally Posted by MelB View Post
24 1/2" long 8 1/4" deep on the long side and 1 5/8" tall. Best gues without pulling it out. the 24 1/2" is accurate.
Sorry that's the aluminum chassis's measurements.
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