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Old 16th October 2005, 05:58 AM   #11
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looks like a cool site, they really ship from israel? i noticed they don't have any prices.
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Old 16th October 2005, 12:04 PM   #12
Vidalgo is offline Vidalgo  Israel
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Yes, it's israel branch of RS Components UK. Office in Rishon. Local stock, probably not for all items.
Prices. Long time ago, next link was running for price info:
http://price.rsisrael.co.il/ , but not today.
Check prices by phone or go to RS Global for an reference points.
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Old 16th October 2005, 12:58 PM   #13
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Hi,

I ordered today C-core transformers from Rozen et Miller (thank you Yuval for the lead). They are located at Salame 33 Tel Aviv. I'm supposed to get them in a week so I will let you know about the results. Anyhow the guy is very nice and seems to know what he is doing.

Teddy
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Old 16th October 2005, 03:03 PM   #14
yehuda is offline yehuda  Israel
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I have ordered toroidial transformers from Farnell Israel, which shippes from England.

Cha'g Sma'ach!!

Yehuda
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Old 16th October 2005, 06:13 PM   #15
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Default Re: torodial transformers?

Quote:
Originally posted by monomonster
the thing is i heard that there are many "levels" of torodial transformers and most are not audio quality
Did you also hear what it is that makes some toroids suitable for audio and some unsuitable?

I_F
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Old 16th October 2005, 07:58 PM   #16
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Audiophile-grade toroidal transformers are wound with oxygen-free copper wire, silver-plated with teflon coating, have gold-plated cores, and magnetically defluxed mounting hardware. Also, the winding machine uses tube-based logic with an even number of factory employees. Factories with odd numbers of employees produce transformers which are distorted and unpleasing to the human ear.

Seriously, any decent transformer with good regulation should work fine. And good regulation generally comes "free" with a large VA rating.

Wes
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Old 16th October 2005, 10:03 PM   #17
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Other than the last statement regarding regulation and size, the preamble is sadly all too typical of the mockery of those who evidently never made measurements or comparisons.
Toroids do have smaller extraneous magnetic fields than other geometries, and above a certain size, they are smaller and less expensive. But the typical low cost toriod, with no shielding between its overwound primary and secondary, has very high bandwidth via its high capacitive coupling, making a resonable tube output transformer, passing whatever noise is on the mains line. Toriods with interwinding shields are quite expensive.
Other geometries such as shielded or split bobbin EI cored, flatpacks and C/R-Cores with physically separated windings, measure, and SOUND better.
Certainly, powerline filtering can address some of these issues, but little beats using a properly specified transformer.
FWIW
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Old 16th October 2005, 11:57 PM   #18
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pmkap:

I do not for one moment believe that an unshielded, inexpensive toroidal transformer is unsuitable for use in audio-equipment power supplies.

Wes
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Old 16th October 2005, 11:59 PM   #19
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When I went to Harbuch they said that that do 160VA transformers wound on a 300VA core specially for audio. the bigger core reduces the flux density... (which I assume leads to less electromagnetic emissions).

Tony.
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Old 17th October 2005, 12:01 AM   #20
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Quote:
Originally posted by wes-ninja250
pmkap:

I do not for one moment believe that an unshielded, inexpensive toroidal transformer is unsuitable for use in audio-equipment power supplies.

Wes

Hi Wes, If you had used some of the ones I have had, you may change your mind I've had major problems with radiated noise from (not so cheap) Toroidals!

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