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Old 6th November 2006, 10:39 PM   #1
jduffy is offline jduffy  United States
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Default Los Angeles brick and mortar that sells toroidal transformers and Nat Semi LM3875TF

I'm trying to get the parts together to build a Gainclone amp. Have the caps and resistors already, but I need the transformer and the Nat Semi LM3875TF. No luck finding a brick and mortar store yet in the Los Angeles area with this items.

Any ideas out there? I've asked the people at a couple of electronic parts stores but they don't know of any places.

Thanks for the help.
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Old 6th November 2006, 10:48 PM   #2
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Default parts

www.partsexpress.com sells avel linburg transformers
www.digikey.com for the chips
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Old 6th November 2006, 11:44 PM   #3
CarlosT is offline CarlosT  United States
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Who sells Bicron toroidals? They make plain vanilla 60hz toroidals.
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Old 7th November 2006, 05:10 AM   #4
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Jduffy,

I live in the O.C. and have the parts you are looking for. I am not a merchant, just have extras. They are new and were purchased from reputable companies. If you are interested just send me an e-mail.
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Old 7th November 2006, 08:38 AM   #5
jduffy is offline jduffy  United States
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Sorry but I can't send email because I'm a new member. I have to wait until I have X number of posts first.

Thanks for the offer though.
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Old 7th November 2006, 01:16 PM   #6
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The fellow who sells torroids on EBay is worth a visit -- AnTek -- these are stepper motor/CNC toroids -- obviously from China and obviously "very strong stuff" -- put toroid in the EBay search engine. Bringing transformers from New Jersey to California is like coals to newcastle, however. AnTek also sells nice aluminum and steel cases.

As a newbie, I would try to dissuade you from using the TF version of the LM3875 or LM3886 -- reason being that the insulation is a real heat barrier. While the insulation makes it more convenient to use, the thermal impedance is something like 1 degree C/ watt. This translates to a whoppingly bigger heat sink for the same amount of power dissipation. I have found no difference between the T and TF versions when listening (but others have differing opinions.)

Try using the mica insulator vresion with silicon grease on each side -- you can use pretty high mounting pressure with these two chips. (something you can't do with the LM4780.)
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Old 7th November 2006, 04:11 PM   #7
CarlosT is offline CarlosT  United States
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Digikey sells some waxy stuff that is supposedly superior to grease...Ultrastick? Sounds pretty groovy...

http://rocky.digikey.com/WebLib/Aavi...Ultrastick.pdf
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Old 25th November 2006, 09:41 AM   #8
jduffy is offline jduffy  United States
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Thanks for the help.

A guy hooked me up with a nice transformer and a couple of the LM3875s. I went with the insulated variety but not a problem cooling. I was an overclocker back in the day and have plenty of heatsinks.

It took a couple of hours to build but no major hassles. It was crazy simple wiring it up.

Not a bad sounding amp, particularly when you figure it cost me about $65 and I had fun building it. Best part is that I can keep tweaking the thing when I get bored with it.

Good times!
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Old 25th November 2006, 02:53 PM   #9
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Location: Wisconsin....what did you expect?
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Quote:
Originally posted by jduffy
Thanks for the help.

A guy hooked me up with a nice transformer and a couple of the LM3875s. I went with the insulated variety but not a problem cooling. I was an overclocker back in the day and have plenty of heatsinks.


Good times!
I wonder when we're going to see the first watercooled gainclone?

Just curious, but why not use computer-grade thermal paste, like Arctic Silver? Computer overclockers swear by the stuff, and with heavy thermal loads (like a power amplifier or Prescott), it's been show to drop the temperature by a few degrees.
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Old 25th November 2006, 04:44 PM   #10
CarlosT is offline CarlosT  United States
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How 'bout these little nifty copper heatsinks? Would they add much cooling to the print side of an LM3875?

http://www.thermaltakeusa.com/2005/c...ry/ramsink.htm
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