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Old 23rd March 2008, 07:28 AM   #1
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Default Where to buy HT toroids ?

Hi all,
Looking for a good place to buy HT toriods (with or without fillament secondaries) for my Aikido preamp project.
Specs:
Primary: 230VAC
HT Secondary: 210 to 250VAC
Thanks in advance
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Old 23rd March 2008, 09:02 AM   #2
Stixx is offline Stixx  Germany
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This is what comes to my mind:

http://www.tube-town.net/ttstore/pro...VA-Preamp.html

http://ampdesign.de/Trafos.htm has toroids but mostly for poweramps...

and then www.askjanfirst.de has a custom winding service for toroids...
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Old 23rd March 2008, 09:05 AM   #3
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A toroidal is a poor choice for HT because it will let all the line crud into your preamp. EI transformers choke off that same crud so are a better option. Unless you have a very specific reason for using a toroid then I advise dropping the idea.

Piltron make good HT torodials.

Shoog
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Old 23rd March 2008, 09:29 AM   #4
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My mistake

Please insert "transformer" instead of "toroid" It was fault 40 .....
I very well know that it should be an EI.

Stixx;
Thanks for the links
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Old 23rd March 2008, 10:05 AM   #5
Colt45 is offline Colt45  Serbia
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Any old isolation trafo should work.. 230:230, for shavers and things that need isolation.
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Old 23rd March 2008, 11:46 AM   #6
Stixx is offline Stixx  Germany
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Quote:
Stixx, thanks for the links
You're welcome!

For EI transformers the choice is much bigger...

again www.askjanfirst.de
or www.reinhöfer.de (both very good reputation)
or http://www.ae-europe.nl/

but there must be tons of others...Lundahl, Sowther, Hammond etc.
On Eeehbay you will find a lot of used transformers out of old radios that should be suitable for a pre.
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Old 23rd March 2008, 12:13 PM   #7
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Thanks again
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Old 23rd March 2008, 12:41 PM   #8
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By 2 of any cheap low voltage transformer - say, something with 12V secondaries.

Then connect them back to back (i.e. 12volt winding to 12 volt winding). The whole setup then makes a 230 to 230 V transformer.

or

buy one, but run it backwards, feeding the 12Vac 'primary' from a cheap ac plug pack power supply. You can rectify/regulate/drop the 12vac directly for heater supplies as well.
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Old 23rd March 2008, 01:34 PM   #9
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If you can ship it, Merrimack Transformers in Ireland will wind for you.

http://www.merrimack.ie/

http://farm3.static.flickr.com/2406/...ee9be9.jpg?v=0

middle transformer.

That's where mine was done, but i guess shipping to denmark could be painful!!
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Old 23rd March 2008, 01:40 PM   #10
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Thanks hotbottle and Psychobiker
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