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Old 3rd April 2009, 07:04 PM   #1
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Question Starting a Simple SE build...

New (old) guy here.... sadly I've contracted this awful disease - I can't seem to be able to buy anything audio related anymore. I have to BUILD it. Weird.

So I am now building - or will be building a Simple SE. I've pulled together all of the parts I'll need but there are a couple that I'm having trouble sourcing.

First the volume pot. Based on the schematics I need a dual 50k pot. I found a couple on Digikey but they were >$22 each. Seemed kinda high.

Second, the power choke. I thought I saw a part number on tubelab, but I can't seem to find it again!!!

I'm attaching the list of parts I chose and prices so I can add up what this is going to cost me.

At the moment I have an S5 16LS amp driving Fostex FE166E homebuilt horns - and it sounds damn good... but slightly lacking.

From the list below I have chosen the Allied power transformer and the Edcor OPT's. The Edcor's are 3 weeks out !!!!

Tube lab design

Output tubes EL34 (soviet) T-EL34-WC-MP $46.4 (both)
input gain tube 12AT7
T-12AT7-FND 12AT7 - DUAL TRIODE, FENDER $10.25
www.tubesandmore.com
rectifier tube 5AR4
T-5AR4-SOVT $16.95
www.tubesandmore.com

Power transformer hammond 274BX $92.36
http://www.newark.com/hammond/274bx/...questid=272086

Also can use Allied 6K7VG $50.32
http://www.alliedelec.com/Search/Pro...013&DESC=6K7VG

output transformer $117.95 x 2
TRANSFORMER, OUTPUT, ONE ELECTRON, 4800 TO 16/8/4
www.tubesandmore.com
another OPT choice: CXSE25-8-5K $83.50 x2
http://www.edcorusa.com/Products/Sho...ct.aspx?ID=465

Circut board $43
tubelab.com

Digikey parts $92.12


Hammond chassis $26.02

subtotal $427 - $520

shipped Digikey $128.66
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Old 3rd April 2009, 07:47 PM   #2
rknize is online now rknize  United States
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Default Re: Starting a Simple SE build...

Quote:
Originally posted by oldmanStrat
New (old) guy here.... sadly I've contracted this awful disease - I can't seem to be able to buy anything audio related anymore. I have to BUILD it. Weird.
Common disease. There is no cure except for more cow bell...er projects.

Quote:
First the volume pot. Based on the schematics I need a dual 50k pot. I found a couple on Digikey but they were >$22 each. Seemed kinda high.
Radio Shack still sells one that I have used many times. It is very good. A 100k pot will work fine too...just make sure it's audio taper.

Quote:
Second, the power choke. I thought I saw a part number on tubelab, but I can't seem to find it again!!!
http://www.alliedelec.com/Search/Pro...006&DESC=C-14X

Quote:
From the list below I have chosen the Allied power transformer and the Edcor OPT's. The Edcor's are 3 weeks out !!!!
Yeah, it's a bummer but I for one am glad to hear they are busy. Their stuff is a great value for the money as they make top notch stuff.

Quote:
Power transformer hammond 274BX $92.36
http://www.newark.com/hammond/274bx/...questid=272086

Also can use Allied 6K7VG $50.32
http://www.alliedelec.com/Search/Pro...013&DESC=6K7VG
You can also use Edcor XPWR035, which barely gets warm in my Simple SE. Here are the specs:

370-0-370 @ 200mA
6.3 VCT @ 5A
5V @ 2A

Quote:
output transformer $117.95 x 2
TRANSFORMER, OUTPUT, ONE ELECTRON, 4800 TO 16/8/4
www.tubesandmore.com
another OPT choice: CXSE25-8-5K $83.50 x2
http://www.edcorusa.com/Products/Sho...ct.aspx?ID=465
I have both of these. Be aware that the One Electron does not have a 40% tap, so you won't be able to run Ultralinear if you want. I have the CXSE25-8-5Ks as well. They are monsters but they sounded great when I had the rig bread-boarded.

Quote:
Hammond chassis $26.02
What size is this? Be warned that all that iron is REALLY TIGHT on a 10x12" chassis:

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

Russ
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Old 3rd April 2009, 09:46 PM   #3
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For audio pots- Alpha are pretty good, especially for the money.
Mouser part# RV24BF-10-15R1-A50K

I agree with the advice to make the chassis large enough.... though they are expensive.
It's a lot easier to control hum problems if you have enough space to route signal wires apart from AC.

If you are 'handy' you can make a chassis with a wood frame and aluminum top plate. I really like the Eric Kingsbury (pointz- audiotropic.com) style chassis, and have used it on a few different projects.

Cheers
John
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File Type: jpg pointz chassis.jpg (11.0 KB, 1208 views)
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Old 3rd April 2009, 11:15 PM   #4
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Default Re: Re: Starting a Simple SE build...

Quote:
Originally posted by rknize

Common disease. There is no cure except for more cow bell...er projects.
cowbells? I'm afraid to ask.

Quote:
Radio Shack still sells one that I have used many times. It is very good. A 100k pot will work fine too...just make sure it's audio taper.
Just what I need - an excuse to go to RS and harass the teenagers. (Can you show me your vacuum tube section?)

Quote:
http://www.alliedelec.com/Search/Pro...006&DESC=C-14X

Yeah, it's a bummer but I for one am glad to hear they are busy. Their stuff is a great value for the money as they make top notch stuff.
Thats what I heard - I also like the way they look

Quote:
You can also use Edcor XPWR035, which barely gets warm in my Simple SE. Here are the specs:
I'll check it out once Edcor's site is back up.... they seem to be having issues lately.

Quote:
What size is this? Be warned that all that iron is REALLY TIGHT on a 10x12" chassis:
It is a 10x12. But I have only bought the cover for that chassis. My plan is to build a box out of red oak - mount everything on the cover put the cover on top of the box - with the volume out the front and the power & I/O out the back.

Thanks for your input!
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Old 3rd April 2009, 11:15 PM   #5
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Quote:
Originally posted by VictoriaGuy
If you are 'handy' you can make a chassis with a wood frame and aluminum top plate. I really like the Eric Kingsbury (pointz- audiotropic.com) style chassis, and have used it on a few different projects.
John
Yes building the box + alum top is exactly what I have in mind. The link for the volume pot is just what I am looking for...

Can you send me the link for Eric's stuff - I'd like to take a look...

Thanks!
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Old 3rd April 2009, 11:38 PM   #6
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Default More cowbell...

I need more cowbell!!

http://clamshare.com/videos/135/snl-more-cowbell.html
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Old 3rd April 2009, 11:39 PM   #7
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Default poinz can be found at

www.audiotropic.net
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Old 3rd April 2009, 11:46 PM   #8
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The Simple SE is a great amp to build. I still enjoy mine. I posted a long thread while I was building it, and in the middle is my parts list. Maybe it'll give you some ideas:
http://www.diyaudio.com/forums/showt...60#post1591160

I thought it was a little less expensive to buy most parts from Mouser, and some of the high voltage capacitors and the semiconductors from DigiKey.

I'll second the recommendation for a good sized chassis. I used a 9"x14" aluminum top plate. It all fit, but just barely. Larger would be better.

Cow bell fever is tough. I can't help you there. Gotta get some BOC to fix that...
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Old 4th April 2009, 12:55 AM   #9
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Quote:
Originally posted by oldmanStrat

Can you send me the link for Eric's stuff - I'd like to take a look...
I had the audiotropic link incorrect- sorry- it's .net, not .com

Aardvarkash has the link for you, above.

If you don't want to do the 'trick' in the Pointz chassis with the wiring from the PS to the amp hidden in the wood frame, you could just float a nice wood panel in the space between the 2 parts of the chassis.

BTW, the Pointz MM is a really good sounding amp for your next project.

Cheers
John
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Old 4th April 2009, 02:12 AM   #10
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Default and!

he's a very obliging, informative and friendly sort too! A gent in the most delightful state of the USA (imho).
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