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Old 6th February 2003, 09:57 AM   #1
Mecanp is offline Mecanp  Greece
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Question which are the BEST toroids?

Hello guys. I m new here and have a question:
Me and a friend are to build a state-for-the-art PSU for his Krell preamp. currently we are trying to decide which toroid transformer to use,the specifications are:
Primary 220V frequency 50 hertz
Dual secondary voltage 30+30 V
Secondary current 5,5 A-330VA
Since its a Krell preamp in a high-end system, thus the highest quality is indispensable. We are between Hammond, Avel-Lindberg and Plintron
But which one is the best?
Thanks
PS.I m really interested in knowing what transformers the top companies (Mark Levinson,Classe,etc)use..
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Old 6th February 2003, 10:30 AM   #2
Taco is offline Taco  Netherlands
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I think those companies let their trannies custom made with the specs they want. So I don't think that you can find completely the same transformers.
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Old 6th February 2003, 10:39 AM   #3
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Hi and welcome,

As far as I know, some Krell preamp I'v repair are using Avel transformers.
I recomend Plitron, Not Plintron, I think that thats a combination of PLINIUS and PLITRON

The sec. voltage will probably become a problem, cause they don't have (I think) the same sec. voltage as the Krell power supply you have.

Let us know the results in the end.

All the best AF.
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Old 6th February 2003, 12:06 PM   #4
SDF is offline SDF  France
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Nuvotem talema toroids encapsulated transformers are good too, and they are not expensive parts
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Old 6th February 2003, 12:40 PM   #5
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From what I know Plitron is building transformers for Classe, ML, Wadia, Bryston. They also have a stock 2 x 30V, 400VA toroid for about $70 CAD. Lead time is approx 4 weeks. Size: 4.7" x 2.7"
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Old 6th February 2003, 01:25 PM   #6
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Default Re: which are the BEST toroids?

Quote:
Originally posted by Mecanp
Hello guys. I m new here and have a question:
Me and a friend are to build a state-for-the-art PSU for his Krell preamp. currently we are trying to decide which toroid transformer to use,the specifications are:
But which one is the best?
Thanks
PS.I m really interested in knowing what transformers the top companies (Mark Levinson,Classe,etc)use..
Hi Mecanp,
You can do better than Krell et. al. by using a split bobbin or dual chamber transformer. The latter have much lower bandwith and let through less garbage from the mains. I am not impressed by the Krell powersupply. Not only do they use toroids but also do have no mainsfilter at all.
This whole issue is documented in the Audio Amateur (now Xpress) Magazine 1995 page 34 e.f. Regulators for High-performance Audio by Gary A. Galo.
I did a comparing listening test wih my preamp using a toroid and a split bobbin of the same voltage and wattage rating. It is not a day and night difference but the split bobbin is the clear winner!
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Old 6th February 2003, 01:51 PM   #7
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Or maybe consider something like that: http://www.custommag.com/CMIHOME.HTG/rcore1.htm
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Old 6th February 2003, 02:53 PM   #8
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I don't dare to say that Toriod International is the best (km!) but they make quite alright products. S.A.T (Swedish Audio Technology) and Advantage (Michael Bladelius) uses them and myself also.
http://www.toroid.se/
http://www.toroid.com/ american part
Special audio transformer http://www.elfa.se/elfa/produkter/se/20/2020471.htm

Notice the even winding!
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Old 6th February 2003, 04:02 PM   #9
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by Peter Daniel
Or maybe consider something like that: http://www.custommag.com/CMIHOME.HTG/rcore1.htm

Or the same core from http://www.selectronic.fr/ which is in Europe/EU.
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Old 6th February 2003, 08:16 PM   #10
Mecanp is offline Mecanp  Greece
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Thanks for the replies and info .
..."Plintron, I think thats a combination of PLINIUS and PLITRON"....Nice one ! Yeah Plitron, since this Canadian factory is building transformers for Classe/Madrigal-ML then is the one for me,because IMO ML are the best SS amps in the world .
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