Transformer orientation

sweet & juicy SE amp for 1626 Darlings and the 6L6 family

A or B?

A
10
83%
B
2
17%
 
Total votes : 12

Transformer orientation

Postby Ty_Bower » Tue Aug 09, 2011 5:38 pm

Using the Edcor GXSE-10 and the Edcor XPWR transformers... which arrangement would you choose?

Shannon built his this way... we'll call this option A.
Image

Dynaco arranged the ST35 this way, sort of. The GXSE are a little different in that they lay down on their long side, rather than stand upright. You can call this one option B.
Image
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Postby katabatic » Tue Aug 09, 2011 7:14 pm

Morgan Jones in "Building Valve Amplifiers" (pages 10-11) votes for #1, saying that 'transformers leak most flux along the axis of their coils and where the edges of their coils are furthest from the core.' Meaning aim the PT's laminations at the tubes. I think....

George
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Postby TomMcNally » Tue Aug 09, 2011 9:50 pm

I use the "A" configuration almost all of the time. The only exceptions seem
to be when "B" is physically a better fit on a small chassis, like a diytube
ST-35 in a 12x8 chassis.
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Postby Geek » Wed Aug 10, 2011 12:01 am

I use "A" because the EMF off the power tranny is the least off the corners (45 degrees) and induces the least hum in the tubes in the position in front of the OPT's.

I put the rectifier right in the middle, where there's no worries about hum.

Now if you have a Z-mount (like a PA-060), make sure the centre leg is aimed at the output trannies.

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Postby Shannon Parks » Wed Aug 10, 2011 4:48 am

My methodology was merely to keep the Edcor labels facing forward. (lol)

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Postby Geek » Wed Aug 10, 2011 7:43 am

separks wrote:My methodology was merely to keep the Edcor labels facing forward. (lol)

Shannon


(y)

Brian & Phyllis should give you a deal for that ;) :))

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Postby elbinster » Wed Aug 10, 2011 8:03 am

I have not built as many amps as some people herhume, but I haven't noticed any induced hum from transformer leakage. Sure, physics says it's possible, but why would you hide those Edcor labels? ;) :))
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Postby kku » Wed Aug 10, 2011 12:19 pm

Pete Millett made his(and so did most of the builders) Jonokuchi spud amp in B configuration.

http://www.pmillett.com/Jonokuchi.htm
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Postby Ty_Bower » Wed Aug 10, 2011 5:30 pm

Well, I think I'm still every bit as uncertain as I was when I started. (???)

I might just go with whatever seems to fit best...
"It's a different experience; the noise occlusion, crisp, clear sound, and defined powerful bass. Strong bass does not corrupt the higher frequencies, giving a very different overall feel of the sound, one that is, in my opinion, quite unique."
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Postby EWBrown » Thu Aug 11, 2011 4:43 pm

I normally use the"A" orientation, but in most cases, it really doesn't make any difference, as long as the OPT cores are 90 degrees separated from the PT.

If you use a PSU choke like the C354, its core is oriented vertically, so it wil be oriented 90 degrees "orthagonally" (mutually exclusively) from both the OPTs and the PT cores.

Mostly, it's just a matter of personal aesthetics, whatever looks best is the way to go (love)

/ed B
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Postby TerrySmith » Sat Aug 13, 2011 2:23 pm

I wonder if you could get the GXSE-15xx transformers made with vertical end covers instead of horizontal? I'm planning on using a Hammond 10x6 box and that would free up some real estate!
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Postby Geek » Sat Aug 13, 2011 4:57 pm

Ty_Bower wrote:Well, I think I'm still every bit as uncertain as I was when I started. (???)


The vote is 4:1 for "A".... how you confused, bro? ;) (lol)

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Postby Ty_Bower » Wed Aug 24, 2011 6:34 pm

Geek wrote:The vote is 4:1 for "A".... how you confused, bro? ;) (lol)


Fine, fine. The A's have it.

Image

It'll look better after I prime and paint it.
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Postby katabatic » Wed Aug 24, 2011 8:26 pm

Ty, if I can be nosy, what is the size of your chassis plate? I'm looking at 9x12 or so for mine, and yours looks like it might be about the same. Just wondering if I'm making it too big. Thanks.

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Postby Ty_Bower » Thu Aug 25, 2011 5:06 am

It is 10 5/8" wide by 8 1/8" front to back. The transformers will be GXSE10, whenever they get here.

I've always made my chassis plates out of whatever scrap aluminum I could dig up, and this is what I found. If I moved the transformers a little closer to each other, it would fit on a 9" wide chassis without too much trouble. If I moved all the binding posts, input jacks, etc to a rear apron (like on a Hammond chassis), I might be able to squeeze everything onto a 6" chassis (front to back), but I don't think I would recommend it.

I typically use 1/8" thick aluminum plate, but this piece was about half that thickness. I'm pretty sure it's going to flex once the transformers are on, and I'm going to need to reinforce it from the bottom with a piece of angle.

You can never make a chassis too big. Just spread the transformers apart more. :))
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