RobRob bucking transformer

[Jason McG]

Found the perfect housing for the RobRob simple bucking transformer, if anyone is planning to build one. The Hammond 1590KBK, all aluminum, very robust, just the right amount of space for a compact layout.

Need to dremel out an opening for the plug and drill a few holes, but drills fine with regular woodworking bits.

 

[Milspec]

Remember to mark which outlet is which I just took a sharpie to it, but you might want to be a little fancier.

 

[robrob]

Nice work.

 

[The Ballzz]

Found the perfect housing for the RobRob simple bucking transformer, if anyone is planning to build one. The Hammond 1590KBK, all aluminum, very robust, just the right amount of space for a compact layout.

Need to dremel out an opening for the plug and drill a few holes, but drills fine with regular woodworking bits.

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Do you have a link to the treatise on what that does, how it works and how to build it?
Thanks,
Gene

 

[The Ballzz]

@Jason McG

Never mind, I found it, and nice work!
Thanks Again,
Gene

 

[robrob]

Here's the info on the bucking transformer. It drops your wall voltage so your vintage electronics see the voltage they were designed for.

https://robrobinette.com/5e3_Modifications.htm#Bucking_Transformer

 

[chas.wahl]

Nobody's yet commented on how OP omitted the switch. Nice and clean. If you need full wall voltage, just plug the amp into the wall. I'll copy that.

BTW, another transformer that can be used for this is a Triad, model VPS12-6300. It will fit in the same 1550K box that @Jason McG used.

 

[robrob]

That is the "Simplified" version. Scroll down a little from the "Buckminister" version.

 

[Jason McG]

Remember to mark which outlet is which I just took a sharpie to it, but you might want to be a little fancier.

 

[Jason McG]

That is the "Simplified" version. Scroll down a little from the "Buckminister" version.
View attachment 943218

love the simplicity Rob, nothing to bump or fail

 

[King Fan]

Nice. That does look pro.

The aluminum lid looks nicer than a household switch plate, too, even the enameled metal one I finally found. How did you cut the hole in the lid for the outlet? All Dremel all the time?

And I may have missed it in the pics, but how / where did you anchor the household power ground?

 

[Jason McG]

Nice. That does look pro.

The aluminum lid looks nicer than a household switch plate, too, even the enameled metal one I finally found. How did you cut the hole in the lid for the outlet? All Dremel all the time?

And I may have missed it in the pics, but how / where did you anchor the household power ground?

yes, dremel and cut off wheel for cutting through lid, tidy up with a flat file

household ground to the ground terminal, with a lug down to the chassis, then from the ground terminal to the ground on the receptacle

 

[Jason McG]

happy amp, happy life!

 

[Jason McG]

.

 

[King Fan]

Thanks for the extra build details. I’m thinking your build is a great, even inspiring, invitation to anyone looking to build one of these super-useful little guys….