Simple SE optimum layout for hum

webby · 15th July 2009, 09:44 AM

Hi All,
I have my PCB, so the Simple SE build begins.
I have a friend helping me out with both a 2D chassis template and a 3D render, I plan to share this with anyone who wants it.
I wanted some feedback on layout and dimensions please. So far I have decided on copper sheet 500 x 400mm with four folds to create a 400 x 300mm top plate, but of course this can change.
And will be using the following iron;
Edcor CXSE25-8-5K OPT.
Edcor xpwr059
Hammond 193H choke
And an Ebay Motor run cap.

After reading Morgan Jones I am trying to confirm best practice for the iron with regard to Hum and electromagnetic induction. Is layout 1 or 2 correct and are there any minimum gaps between components. I have looked at several SE builds and have seen both layouts?

Can I also ask about finishing and polishing copper sheet, do I need to lacquer to stop oxidisation?

Many thanks
Ian

bigjppop · 15th July 2009, 11:27 AM

We have almost identical builds planned; all the same parts, right down the list. I am still waiting for my transformers (and tube sockets) so that I can get started putting things together. I'd love to see the renderings you come up with as I'm still mulling over layout designs.

webby · 15th July 2009, 11:29 AM

Not sure why the images didnt upload,
Try again
Cheers

webby · 15th July 2009, 11:38 AM

Or this option?
Thanks
Ian

nic6paul · 15th July 2009, 11:40 AM

I did mine similar to your first option. I have zero hum

webby · 15th July 2009, 11:50 AM

That's interesting. I thought the second option would be the best method.
Having the transformer laminations pointing away from the tubes?
This is why i am confused, did you have lots of space between the iron and PCB?
Cheers
Ian

nic6paul · 15th July 2009, 11:53 AM

Not really everything was pretty tight when I built it

Not the best photo

tubelab.com · 15th July 2009, 12:30 PM

Mine have all been similar to your second choice except that I tend to swap the choke and the power transformer for purely asthetic reasons. I want all of the big stuff lined up across the back. I am building a Tubelab SE right now. I have all the big transformers lined up across the back. I put the motor run cap between the choke and the power transformer. Time has been scarce and this one has taken over a year to build, but it should be done in a few weeks.

I don't think that there will be much difference between either choice.

rknize · 15th July 2009, 02:38 PM

I'd say it's a wash and you should go with whichever is more esthetically pleasing to you. You can see my arrangement in my avatar, though the choke is under the chassis. I also considered your exact arrangement, but it was too tight for the 10x12" chassis I was considering using. You can see what it might have looked like here:

http://www.diyaudio.com/forums/showt...61#post1783961

webby · 15th July 2009, 03:01 PM

Thanks people,
I have read lots of Simple SE threads loads of really good info, have noted your excellent SE as well Russ. I just wanted to understand the whole transformer orientation subject, its all new to me. Hum fields and beam valves best practice and how it relates to the layout of the SSE layout.
Please keep your suggestions coming.

Many Thanks George for the excellect PCB and project.
Cheers
Ian

15th July 2009, 09:44 AM	#1
webby diyAudio Member Join Date: Jul 2004 Location: england	Simple SE optimum layout for hum Hi All, I have my PCB, so the Simple SE build begins. I have a friend helping me out with both a 2D chassis template and a 3D render, I plan to share this with anyone who wants it. I wanted some feedback on layout and dimensions please. So far I have decided on copper sheet 500 x 400mm with four folds to create a 400 x 300mm top plate, but of course this can change. And will be using the following iron; Edcor CXSE25-8-5K OPT. Edcor xpwr059 Hammond 193H choke And an Ebay Motor run cap. After reading Morgan Jones I am trying to confirm best practice for the iron with regard to Hum and electromagnetic induction. Is layout 1 or 2 correct and are there any minimum gaps between components. I have looked at several SE builds and have seen both layouts? Can I also ask about finishing and polishing copper sheet, do I need to lacquer to stop oxidisation? Many thanks Ian

15th July 2009, 12:30 PM	#8
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	Mine have all been similar to your second choice except that I tend to swap the choke and the power transformer for purely asthetic reasons. I want all of the big stuff lined up across the back. I am building a Tubelab SE right now. I have all the big transformers lined up across the back. I put the motor run cap between the choke and the power transformer. Time has been scarce and this one has taken over a year to build, but it should be done in a few weeks. I don't think that there will be much difference between either choice. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

15th July 2009, 02:38 PM	#9
rknize diyAudio Member Join Date: Feb 2009 Location: Chicagoland	I'd say it's a wash and you should go with whichever is more esthetically pleasing to you. You can see my arrangement in my avatar, though the choke is under the chassis. I also considered your exact arrangement, but it was too tight for the 10x12" chassis I was considering using. You can see what it might have looked like here: http://www.diyaudio.com/forums/showt...61#post1783961 __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

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15th July 2009, 11:27 AM	#2
bigjppop diyAudio Member Join Date: Jun 2009 Location: Berlin	We have almost identical builds planned; all the same parts, right down the list. I am still waiting for my transformers (and tube sockets) so that I can get started putting things together. I'd love to see the renderings you come up with as I'm still mulling over layout designs.

15th July 2009, 11:40 AM	#5
nic6paul diyAudio Member Join Date: Jan 2007 Location: Minnesota	I did mine similar to your first option. I have zero hum

15th July 2009, 11:50 AM	#6
webby diyAudio Member Join Date: Jul 2004 Location: england	That's interesting. I thought the second option would be the best method. Having the transformer laminations pointing away from the tubes? This is why i am confused, did you have lots of space between the iron and PCB? Cheers Ian

15th July 2009, 11:53 AM	#7
nic6paul diyAudio Member Join Date: Jan 2007 Location: Minnesota	Not really everything was pretty tight when I built it Not the best photo

15th July 2009, 03:01 PM	#10
webby diyAudio Member Join Date: Jul 2004 Location: england	Thanks people, I have read lots of Simple SE threads loads of really good info, have noted your excellent SE as well Russ. I just wanted to understand the whole transformer orientation subject, its all new to me. Hum fields and beam valves best practice and how it relates to the layout of the SSE layout. Please keep your suggestions coming. Many Thanks George for the excellect PCB and project. Cheers Ian

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