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In Reply to: RE: red plates ... bob and weave ... posted by kobasa@xs4all.nl on September 24, 2021 at 11:32:55
"There is nothing wrong with the Magnequest if it was a cheaper transformer (maybe a little more expensive than an Edcore). Or there is nothing wrong with an expensive amplifier if they also used a special quality transformer.
The advertisement was originally for a $18000 amplifier (ok, a silly price) but even $4000 is way too expensive if we look at the components used and or the technology used (no real dc-coupled amplifier)
For the Magnequest, it is EI laminates, probably M6 grade 0.35mm. That's the quality of 1960. Nowadays we have M4..M3..M2..M0 and even better than that. Also EI laminates are not very good, we have C cores. The thickness of the lamination of standard high quality c-cores is much thinner, so we have less eddy currents in the core.
For specials we also have old-fashioned Permalloy but that too is pre-historic. We now have Amorphous and nanocrystalline cores.
And I've been working with amorphous cores for over 30 years so people here are asleep......"
I had the Magnequest DS-025. I believe they were M4 lams on that transformer.
Follow Ups:
It would be nice if you have real data. M4 is better but compared to HiB in some Japanese transformers still lower quality (a lot lower).
Have you read this?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
"Have you read this?"
Interesting he seems to prefer M19 for SE transformers.
"due to no zero crossing"
"M6 is more costly and its attributes not used in SE service"
Tre' I believe you have some Electraprint SE transformers. Are they M19?
(if my memory is wrong I apologize!)
It's not so important what the people at Electra print think about core materials because they don't understand the datasheets about those materials.Look at:
https://www.nipponsteel.com/product/catalog_download/pdf/D003jec.pdf
and
https://www.nipponsteel.com/product/catalog_download/pdf/D005je.pdfM19: http://lookpolymers.com/pdf/AK-Steel-DI-MAX-M-19-Nonoriented-Electrical-Steel.pdf
For those only interested in the outcome of those data sheets: M19 is even more junk (it's for electro motors)
Edits: 09/30/21 10/01/21
Perhaps Denis is interested in non-oriented SiFe core?
North American Iron is where its at Mr Kobasa.
Hammond, Heyboer, Edcor, Electraprint, Intact. (in no particular order)
Exotic core materials are fine - we have that too. If you can hear the difference. I personally don't have the need for that level of detail.
It helps that we have excellent ganja and beer...so really even the old tubed tabletop radio sounds pretty good after enough substance enhancement.
Of all the names you mention, none make transformer cores, but you can find many good transformer core manufacturers in the US of course.
About the ganja and beer I'm not sure, I bet both are better in Europe (although I don't use ganja but Nederwiet is famous). But I agree that if you use it, none of that transformer stuff matters anymore.
the sharpest guy I know with regards to output transformers is Pakprotector.. he's told me of Thomas and Skinner and their SuperOrthoSil laminations.
I looked to order some in M4 but the quantity was beyond my budget. As we agree - for my tastes and listening conditions I may not benefit from higher quality laminations.
https://www.thomas-skinner.com/transformer-laminations/
I know this company. Skip them...
If you want good prices and good material: China
The best market for good cores is asia in general. All the big manufactures are there (also USA based companies)
I know this article, just skip it because it's not very good.
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