Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: printer2 on October 07, 2012, 09:51:37 pm
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You guys seem to have a lot of fun with your amps, thought you might like this one. While there are other 5E3 volume mods out there this one allows you to switch from the 5E3 crazy circuit arrangement that some love and hate to the well behaved voltage divider circuit of the 6G3 circuit. Nice to have both, as long as you don't mind having a four pole toggle switch on your amp you can.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/5E3Interactive-Normalmod.jpg)
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Just for fun, spliced into Fender's layout.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/5E3VolumeModLayout-1.jpg)
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Well decided to build this thing but gave it some extras. Decided in the non-5E3 mode I would rather have the second channel have a bass treble control.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/5E3-5G2-BF.jpg)
So far.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/5E36G2BFchassis01.jpg)
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No interest?
Board ready for parts.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/5E3BFEyeletBoard.jpg)
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I think that it's very interesting. I was trying to figure out what your eyelet board is made of. The mockup of the cabinet looks good. Did you build it yourself? And, what about the chassis? It has a galvanized junction box look to it.
I've built many a project, in my growing-up years, from stuff I found cast off in the back of a local Electric Supply business that my Father bought some of his materials from. The owner would let me wander around back, and he would throw some of my finds in with our other purchases, at no charge. My Mother would cooks something for him and his family, during the Christmas season, in appreciation for tolerating my plunder.
Jack
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It's looking real good!
Is the eyelet board a piece of formica? If so some formica has a thin sheet of aluminum embedded in it to keep it from getting cigi burns. It transfers the heat away and they used it to cover bar tops.
My Mother would cooks something for him and his family, during the Christmas season, in appreciation for tolerating my plunder.
That was nice of her.
Brad :icon_biggrin:
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Yes it is counter top material, no aluminum just plain plastic. Had some scraps at work being thrown out the same day I went scrounging around. The eyelets were from a craft store and I think I got a couple hundred for three bucks or so. I am missing a couple resistors in the picture, the 1M and the grid stopper on the second stage, slipped it in the space where the 5M resistor is.
Did the cabinet myself, I made an extension on my table saw so I could mount a router and made a sled to do the box joints. The trickiest part was the glue up, lot of surfaces to cover and then clamp. I need to get a couple more bar clamps to lake life easy on me.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/IMG_9369a.jpg)
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/IMG_9374a.jpg)
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/IMG_9377a.jpg)
[/img]http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/IMG_9377a.jpg (http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/IMG_9377a.jpg)[/img]
The chassis is galvanized sheet steel used in industrial heating systems, a little thicker than what you would have at home. Kind of a strange design for the chassis as the top is a separate piece and gets bolted on the top, which is open. This way I can make changes to the controls and add or subtract functions. When I get the design completed to my liking I have a top plate of stainless steel waiting to pretty up the build. I bent up the steel at work, we have a shear and brake there, also spot welded the ends.
If anyone were so inclined they could pick up some galvanized sheet from a hardware store (for lighter builds) or get some from a sheet metal shop in town, bend some up using good old hand power, and then screw or rivet it together. I did some quickies at home the odd time.
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/cabnet13.jpg)
(http://i406.photobucket.com/albums/pp142/printer2_photo/guitar%20amp/cabnet11.jpg)