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Old 15th March 2008, 09:34 AM   #31
Tyimo is offline Tyimo  Hungary
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Default O-Core question

Hi!
Sorry for the offtopicquestion, but after reading this:

Quote:
For the german speaking folks, here is a reseller in switzerland who seems to have some types available:
http://www.hifituning.ch/transfor.htm
What is the differences between an O-Core and a normal Toroid transformer?

Tyimo
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Old 15th March 2008, 09:51 AM   #32
JPS is offline JPS  India
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Quote:
What is the differences between an O-Core and a normal Toroid transformer?
Standard toroid has square cross section. O core or
R-toroid as we call it has round cross section.

Standard C core has square cross section and is in two halves. R-core has round corss section and is a single piece made with silicon steel strip.
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Old 15th March 2008, 09:57 AM   #33
Tyimo is offline Tyimo  Hungary
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Thanks JPS!
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Old 15th March 2008, 10:09 AM   #34
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Hi again BrianL - and others!

BrianL
Quote:
JPS, just because UL and CSA have offices in China is no indication that any Chinese transformer you purchase is UL certified
Sorry if I made a little mistake. However, I have found a chinese producer of (high quality?) R-Core transformers. This company states (under "Construction and safety"):

Quote:
The entire production process, no matter whether materials, manufacturing, or survey and inspection, is under strict control. Our products are certified to meet the international safety standards of different countries, such as UL, TUV, VDE and CE, etc.
http://www.rn-core.com/english/products/sort285.asp

Hope that this helps and that I didn´t make another little mistake ;-)

Kind regards

Karsten
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Old 17th March 2008, 05:43 AM   #35
BrianL is offline BrianL  United States
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Karsten,

Interesting,

But now we're back to "where can you purchase them"...
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Old 17th March 2008, 02:50 PM   #36
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side note:

THLAudio in Thailand listed a few dozen dual 42V secondary 280VA R-core transformers they removed from Proton amps, for $15 each.
With added P&H costs, pretty interesting for the Ozyania blokes.
Unfortunately, Dutch customs would fry my heiney if i ordered a couple.

(for the weak of mind: Proton is a Thai audio gear manufacturer, the (NAD designed) D-1200 from 1987 was pretty much the numero-1 power amp with R-core transformers inside.)


Edit-to :Link

PS : James, TY for the Nikko info, no doubt Mr Tsunemoto would agree that i should be flogged in public by a bunch of leather motorcycle dykes for my ignorance. (if only)
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Old 18th March 2008, 11:35 AM   #37
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BrianL

Quote:
Karsten,

Interesting,

But now we're back to "where can you purchase them"...
Hi Brian,

Don´t be afraid to drop the company an email or give them a phone call (email-addresses and phone numbers are shown).

Modern chinese companys have employees who speak very good english. If you are strictly looking for shops where to buy R-Core trafos locally I might, unfortunately, not be able to help you.

I do not know about the prices from the chinese factory, but maybe a group buy could be interesting???

The primary reason for me to show the link was due to the question about different international approvals. At least in the picure their R-Core trafos are good looking :-)

Kind regards

Karsten
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Old 18th March 2008, 11:58 AM   #38
JPS is offline JPS  India
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Aikido as a headphone amplifier (Output transformer groupbuy)


I had made one which was tested by my Kevin and he had suggested improvement. the application was headphone amplifier, but we lost contact. (post 57).
The core size is RC20.

Click the image to open in full size.
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Old 19th March 2008, 03:01 AM   #39
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Default Hello JPS

I've sent you an email

thanks



cds
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Old 19th March 2008, 08:08 AM   #40
JPS is offline JPS  India
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Hi CDS

could not email you from my hotmail account and your email preferance at this forum is blocked too. Is it

c.d.s.@---.com ( hotmail does not send on this address.)
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