Hi DIY
Could you please advise me, I'm looking to find a manufacturer
who could make me custom high end Permalloy with 80% nickel transformers.
Anyone?
Thank you!
best regards
Could you please advise me, I'm looking to find a manufacturer
who could make me custom high end Permalloy with 80% nickel transformers.
Anyone?
Thank you!
best regards
I can highly recommend Monolith Magnetics in Belgium, have used a number of their custom amorphous core transformers in my designs.
They can offer a variety of core materials.
They can offer a variety of core materials.
In the UK there's Techno and Majestic. Also Sowter more expensive.
Lundahl are in Europe.
If it were me I'd be looking at the guy in Bulgaria who posts here as 50AE (I think..).
300B SE Amp: build part III (Layout) – Bartola(R) Valves
Lundahl are in Europe.
If it were me I'd be looking at the guy in Bulgaria who posts here as 50AE (I think..).
300B SE Amp: build part III (Layout) – Bartola(R) Valves
When being quoted, politeness dictates it's necessary to introduce oneself.
I am prototyping, manufacturing, auditioning and testing transformers for audio applications since 5 years. Two years for a company, then on a freelancer scale for the rest three.
My dream is to succeed into building a small business company for transformer manufacture of the highest quality of audio reproduction where its limit will only be dictated by my abilities, the later constantly expanding through RnD and experimentation
Through all these years I'm doing a personal RnD on every detail of transformer construction, where special attention is given to the audibility of materials and their combinations.
I am currently an OEM transformer designer and winder of many products for Thrax Audio, a high-end audio equipment manufacturer. Thanks to Thrax I get provided with exotic materials, such as amorphous, nanocrystalline, nickel and different grades of copper, which give me expansion of the future line of products.
At this moment I'm a tiny scale manufacturer and I'm investing my monetary gains into further RnD and equipment. I cannot afford to go too much in public due the fact I will not be able to satisfy a big amount of orders. Ale Moglia and Rob are some of my greatest customers.
When it comes to transformers, I strive for a specific unique approach towards clients, consisting into in-depth communication, studying their wishes and musical tastes.
Best regards,
Alexander.
I am prototyping, manufacturing, auditioning and testing transformers for audio applications since 5 years. Two years for a company, then on a freelancer scale for the rest three.
My dream is to succeed into building a small business company for transformer manufacture of the highest quality of audio reproduction where its limit will only be dictated by my abilities, the later constantly expanding through RnD and experimentation
Through all these years I'm doing a personal RnD on every detail of transformer construction, where special attention is given to the audibility of materials and their combinations.
I am currently an OEM transformer designer and winder of many products for Thrax Audio, a high-end audio equipment manufacturer. Thanks to Thrax I get provided with exotic materials, such as amorphous, nanocrystalline, nickel and different grades of copper, which give me expansion of the future line of products.
At this moment I'm a tiny scale manufacturer and I'm investing my monetary gains into further RnD and equipment. I cannot afford to go too much in public due the fact I will not be able to satisfy a big amount of orders. Ale Moglia and Rob are some of my greatest customers.
When it comes to transformers, I strive for a specific unique approach towards clients, consisting into in-depth communication, studying their wishes and musical tastes.
Best regards,
Alexander.
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Thank you Alexander for the introduction. Can you give us a broad idea of how your products compare to Monolith and what would be the price range for say a SE 300B similar to Ale's?
Speaking of performance, I prefer not to give an opinion myself, but let the customers do instead. I believe some who did compare my stuff vs Monolith are participating on this forum.
When it comes to aesthetics and a feel of finished product, my products are open framed and lack enclosure, as you can see on DHT Rob and Ale Moglia's blogs. Monolith has done an excellent job containing their products within well made enclosures. Together with Thrax we are working on this part.
In the end, you can view at my products having that OEM look, where for the moment I've aimed mostly towards sound than boutique looks.
I'm attaching three datasheets, to give you some idea of my work. The first is a multitap primary 300B SE kind of OPT with nano/amorphous core with the same dimensions as Ale's. The second is a layered 1:1 interstage transformer. The third one is a power supply choke.
Best regards,
Alexander.
When it comes to aesthetics and a feel of finished product, my products are open framed and lack enclosure, as you can see on DHT Rob and Ale Moglia's blogs. Monolith has done an excellent job containing their products within well made enclosures. Together with Thrax we are working on this part.
In the end, you can view at my products having that OEM look, where for the moment I've aimed mostly towards sound than boutique looks.
I'm attaching three datasheets, to give you some idea of my work. The first is a multitap primary 300B SE kind of OPT with nano/amorphous core with the same dimensions as Ale's. The second is a layered 1:1 interstage transformer. The third one is a power supply choke.
Best regards,
Alexander.
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There is this chap - Audioröhrentechnik Ausgangstrafo Übertrager Bandfilter Spulen Röhren Audio Fassungen 516201 516228 516236 516260 516686 NF-Übertrager Drossel Trafo Hifi Highend I've not ordered from him myself but have heard good things.
Transformatory toroidalne - Producent transformatorow Toroidy.pl
Haven´t tried them myself but you see these quite often in the forum.
Haven´t tried them myself but you see these quite often in the forum.
There is a good reason and it's not the cost of the material.
Tamura used to make permalloy (i.e. 80% nickel) output transformers, the F-7000 series now discontinued. However, to me it has always looked like a statement of their capability rather than a rational choice. There are other nickel alloys more suited for this kind of transformer, IMHO. Permalloy is useful for signal level (small power) without DC current flowing and shielding. At best, for output transformer application, one can use the permalloy for parafeed. But then has to use a capacitor which looks like a cat running after his tail.....
As one of the least great customers i can attest the transformers and chokes Alex winds are first rate.
In fact, they dramatically changed my perception of what transformers and chokes can do for the sound, having replaced iron by UTC, Tango, Lundahl and Feastrex.
Well if want too go exotic with C-cores, the original Hitachi FINEMET comes in C-cores too. The standard sizes should be enough for top quality 10-15W SE OPT (or 20-30W PP).
But all crystalline types seem to be quite brittle and so need a lot of care. Don't know the percentage of discarded cut cores at production level but surely those on sale from unofficial vendors did not look good.
I like the RADIOMETAL 4550 (45% nickel) despite the common shape one finds is EI core. Except for the square shape there is no other disadvantage there like for grain-oriented cores (EI cores are not 100% oriented). I do not consider the square shape a real disadvantage because the bandwidth one can achieve is 80-120 KHz without much trouble.
Practical problem for common people like me is availability in useful sizes. One has to order it normally in good quantity....
But all crystalline types seem to be quite brittle and so need a lot of care. Don't know the percentage of discarded cut cores at production level but surely those on sale from unofficial vendors did not look good.
I like the RADIOMETAL 4550 (45% nickel) despite the common shape one finds is EI core. Except for the square shape there is no other disadvantage there like for grain-oriented cores (EI cores are not 100% oriented). I do not consider the square shape a real disadvantage because the bandwidth one can achieve is 80-120 KHz without much trouble.
Practical problem for common people like me is availability in useful sizes. One has to order it normally in good quantity....
This guy in Romania can make very good permaloy transformer and probably much cheaper than the japanese versions:https://www.diyaudio.com/forums/members/dorin-bodea.html
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I met (and bought) Finemet time ago.
This was fine; after few protos the test were fine.
The I stop to test, it is too expensive and the people aren't happy to spend money even you show the real test.
Walter
This was fine; after few protos the test were fine.
The I stop to test, it is too expensive and the people aren't happy to spend money even you show the real test.
Walter
Thank you for your kind words, Peter!
It's true, they're brittle and flaky. Chinese don't throw stuff away though, they fill chipped holes from the cutting with glue. I had one core with lacking a 2x2x4mm edge chunk filled with binding material. 😀
If one needs the permeability, nanocrystalline and amorphous C cores are NOT the way to go. They get badly cut, even genuine Hitachi amorphous can bleed a lot of light through their gaps. HiB is much better in this aspect. I never worked with C-core nickel though.
If one needs to regrind the surfaces, amorphous is hard as glass (makes sense). Nanocrystalline is soft, but grinding should be really gentle or the surfaces will result in severe pitting, destroying permeability. In fact I've worked with cores from different manufacturers with quite factory pitted surfaces.
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