R-core transformers in UK - diyAudio
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Old 28th March 2011, 04:29 PM   #1
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Default R-core transformers in UK

I have been looking for a source of R-Core transformers in UK, without much success - I wanted transformers made specifically for audio use, with extra inter-winding shield and outer magnetic shielding. As I have been unable to find any source that would be able to supply custom units, I decided got in touch with a manufacturer in China and after exchanging a few polite emails, they agreed to make a small run of custom transformers for me.

The prices currently work out at:
- 50VA, Pri 230V, Sec 12-0-12V (2.1A x2) = 40
- 50VA, Pri 230V, Sec 9-0-9V (2.8A x2) = 41
- 300VA, Pri 230V, Sec1 22-0-22V, Sec2 22-0-22 (3.5A x2) = 85 [ie. for a Gainclone]

These are rough estimates as the exchange rate may change and also making a payment may entail some bank fees (I'm investigating this);
the prices do include delivery from China, but if you don't live in Lancashire, please allow for some UK postage.

If there is more people interested, the price will go down as postage is murderous for single units. Well, it's still murderous for multiple trafos, but quite a bit less so

Anyone who is interested, or has a suggestion of a different trafo, please leave me a message in this thread, and I will get back to you asap.
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Old 28th March 2011, 05:54 PM   #2
Marra is offline Marra  United Kingdom
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I was going to suggest Selectronique in France but there R cores have dual secondaries but aren't centre tapped. Here's the link anyway.

SELECTRONIC ::: L'univers lectronique :::
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Old 28th March 2011, 06:57 PM   #3
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Yes, I know of seletronic, they would work out cheaper, but the specification of their transformers doesn't mention any shielding, so I'm assuming it's not included. In my opinion inter-winding shield is an absolute requirement in a transformer meant for audio use because inter-winding capacitance is where a lot of noise gets into the audio system.

Centre - tapped is not a problem actually as you could join two 0-9V windings into one 9-0-9V.

If I don't hear from anyone by the end of the week I will order on my own.
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Old 28th March 2011, 07:01 PM   #4
tinitus is offline tinitus  Europe
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hey, those 300VA are dual mono trafos
each 'only' 150VA

and quite expencive

if you want special 'audio quality', try contact Toroidy.pl
seems very reliable

or if you can find a local firm who builds old style UI-core
those can be very good too
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Old 28th March 2011, 08:17 PM   #5
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Thanks tinitus, I am already using toroids custom made for me by Mr Lachowski from toroidy.pl

While I believe they will be hard to beat in powering a solid-state amplifier, I am not so sure about my CD player and DAC. Toroids have inherently (relatively) high inter-winding capacitance, and even with a shield between windings I suspect they may be letting in a bit too much mains noise for a digital component.

So I decided to try the R-cores and while I was at it, I thought I might as well ask if someone wants to join the order
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Old 28th March 2011, 10:01 PM   #6
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I think the Selectronic ones feature a shield.
That's what the yellow wire on the primary side is supposed to be.
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Old 28th March 2011, 10:27 PM   #7
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That's actually well spotted... Now that I looked at the pdf again, it does say "Ecran" on one of the drawings...

The trafos in Selectronic are a lot more expensive than the actual prices I got from the manufacturer (approx 13$ for a 50VA trafo), but the postage is likely to be a lot less, so in the end it may work out cheaper. I'll check it.
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Old 30th March 2011, 02:08 PM   #8
h_a is offline h_a  Europe
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Quote:
of their transformers doesn't mention any shielding
They do have or at least used to have one interwinding shield. Pretty well build units IMHO, I liked them!

Hannes
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Old 31st March 2011, 10:08 AM   #9
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Quote:
Originally Posted by TheShaman View Post
the yellow wire on the primary side
.
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Old 19th May 2011, 11:23 AM   #10
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Is this thing over already ? I would like to try two of those 12-0-12, shipped to Norway...
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