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Old 1st March 2008, 03:11 PM   #11
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Kitamura Kiden sells retail through a subsidiary named Phoenix. Their web site is www.pnxcorp.co.jp. The web site is in Japanese so maybe one of our Japanese fluent members can investigate and report back. Please and Thank You. James
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Old 1st March 2008, 05:35 PM   #12
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Kitamura Kiden are the ones who developed the r-core transformers.
From their website:
Quote:
1/1978
It succeeds in development of R core and a patent is acquired in in many countries
If you don't find any source in the States and want to buy from abroad, try Selectronic.
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Old 2nd March 2008, 01:34 AM   #13
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I recently emailed at least 6 different U.S. manufacturers of R core transformers that I found via Google. None bothered to reply, not even the manufacturers that boasted prototyping and "one offs." This experience taught me that there is no U.S. manufacturer of R core transformers willing to sell to the hobbyist.

Aside from the few that are sporadically available on Ebay, there are only 2 sources that I know of:

The place in Hong Kong/ China

The French supplier (100 euro minimum)

Good luck. I gave up on finding an R core transformer in the U.S.
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Old 4th March 2008, 06:22 PM   #14
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I called Electro Assemblies this morning and talked to Jeff Swanson, National Sales Manager. Another nice guy who took time out of his busy day to answer my questions. Electro Assemblies, like CUI Inc, does not manufacture R Cores in house, but buys them from China and resells them in the US. Jeff told me that there are very few companies that are able to manufacture R Cores: two in China, two in India, two in the US, and one in Japan. The US manufactures are Custom Magnetics, North Manchester, IN and Lenco Electronics, Mchenry, IL. I will call both of these companies as soon as I get a chance. Jeff also told me that Electro Assemblies is exiting the R Core business due to soft demand. Jeff believes that the only application where an R Core is superior to a good toroidal and thus worth the extra cost is audio and as Jeff pointed out there just aren't enough US audio manufactures doing large enough volume to make a R Core business. Lastly, I did find another company that sells a limited selection of R Cores online. The web site is:http://www.icl.co.jp/audio/english/index.htm.
James
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Old 4th March 2008, 07:43 PM   #15
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Greetings,
I am looking for R-cores too.
Cambe
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Old 4th March 2008, 11:21 PM   #16
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One place in HK that sells the R-core sourced from China

http://www.vt4c.com/shop/program/mai..._id=7&hit_cat=

her shann
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Old 11th March 2008, 06:16 AM   #17
satoru is offline satoru  United States
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Quote:
Originally posted by jimmyd53
Kitamura Kiden sells retail through a subsidiary named Phoenix. Their web site is www.pnxcorp.co.jp. The web site is in Japanese so maybe one of our Japanese fluent members can investigate and report back. Please and Thank You. James
Hi,

Out of my own interest, I contacted this manufacturer in Japan. The response was quick. Their RA series is intended for individuals and everything is order-made so getting a transformer designed for USA 115V is not a problem at all. Alas, they don't ship to abroad... If there are enough interest (and enough number of people willing to pay the extra shipping), I may consolidate an order...

Regards,
Satoru
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Old 11th March 2008, 06:38 AM   #18
JPS is offline JPS  India
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R-core transformers are available in VA rating of 5 to 1000. I can air mail small qty. from India.

Regards
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Old 12th March 2008, 04:30 AM   #19
BrianL is offline BrianL  United States
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I have looked at a number of vendors mentioned in this thread as well as eBay. As someone mentioned, almost all appear to be made in China no matter where you purchase them. I have not been able to determine whether any of these transormers are built to appropriate safety standards, i.e., UL, CSA, or any of the various European "alphabet soup" of regulatory agencies. Given the horror stories about the lack of quality and quality control in Chinese manufacturing, I'm extremely concerned about the very real possibility of one of these transformers burning my house down after some amount of time. Even the apparently reputable Selectronic company in France gives no indication of agency approval for these transformers.
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Old 12th March 2008, 06:14 AM   #20
JPS is offline JPS  India
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Millions of R-core transformers made in factories in Asia mostly in China- are in use in various equipments worldwide. UL, CSA and EU quality certifying agencies have offices in China, Taiwan, India and many other countries of Asia. Many big manufacturers of transformers in this region have approval of these agencies and importers in USA, Canada, EU import from them.
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