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In the Forum: Audio Discussions
In the Thread: Passive transformer based preamp
Post Subject: Some clarificationsPosted by Thorsten on: 11/7/2005
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A maker of Magnetics reading along has taken me privatly a little to task, it seems I was not clear enough with some of my statements, apologies.
First, I seemingly stated that Amorphous material was "always iron", that was not my intention, amorphous core material comes in many types, however the common one currently emplyed in the large Lundahl Transformers (there are indications that it also applies to their small signal AM transformers, but information is conflicting) and by Opera/DIYHFS is completely Iron based. As such the same BH curves apply fundamentally as they do for steel, what is different is the eddy losses etc.
I am also amused by certain claims that where made by a transformer maker that AM Cores eliminate the LF resonance between the transformers inductance and coupling capacitor, which is a claim I am commonly familiar as applying (not entierly accuratly BTW) to high nickel content permalloy/Radiometal/Mu-Metal et al, but never yet for ferrite and iron/steel cored devices....
Interresting alternatives to iron based AM would be Iron/Nickel/Cobalt (FENICO) Amorphous material, but it seems hard to get and carries an extreme premium over 80% Nickel Permalloy, which may not (or may be) be justified by a similar improvement in sound.... We keep investigating, sadly the demise of Telmag makes such investigation much more difficult for UK companies.
Secondly, my comments on the look of high Nickel content permalloy is based of course merely on my experience. The Hue of Nickel Permalloy is about that of the transformer cans in the picture of the Music First Passive Preamp on this page:
http://www.6moons.com/audioreviews/bo05/srajan.html
I have not yet seen any high nickel permalloy looking significantly different.
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