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Audio and Video Talk
The Vintage Audio Section
Leak, Quad, PYE, Dynaco, Radford - Transformer Iron Quality
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<blockquote data-quote="Ampdog" data-source="post: 847226" data-attributes="member: 144"><p>As to the initial quality of OPT steels used in said amplifiers I have never listened to them (the ones I did listen to) with a purpose to determine quality. As far as I can recall all met the specs, so ....</p><p></p><p>Regarding 'ageing' though, my doubts were just confirmed by an electrical metallurgy designer of international repute. All respect to your source, but 'ageing' of transformers in practice is a myth. Only heat can do that, and temperatures would need to be so high that you will not have a transformer left, only charred remains. He mentioned all the industrial power transformers stil in use, of >70 years old.</p><p></p><p>It is true that excessive hammering of e.g. grain-oriented steels might change the steel lattice structure slightly - again an overrated worry. Also, keep in mind that in small transformers (such as those typically used in amplifiers), iron losses are of the order of 3 - 4%. Even if that doubles (an over-the-rop assumption) chances are small that it will be audible in amplifiers with NFB.</p><p></p><p>I repeat that in my fairly active life with transformers, I have never picked up this phenomenon as worthy of consideration.</p><p></p><p>But now we know.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 847226, member: 144"] As to the initial quality of OPT steels used in said amplifiers I have never listened to them (the ones I did listen to) with a purpose to determine quality. As far as I can recall all met the specs, so .... Regarding 'ageing' though, my doubts were just confirmed by an electrical metallurgy designer of international repute. All respect to your source, but 'ageing' of transformers in practice is a myth. Only heat can do that, and temperatures would need to be so high that you will not have a transformer left, only charred remains. He mentioned all the industrial power transformers stil in use, of >70 years old. It is true that excessive hammering of e.g. grain-oriented steels might change the steel lattice structure slightly - again an overrated worry. Also, keep in mind that in small transformers (such as those typically used in amplifiers), iron losses are of the order of 3 - 4%. Even if that doubles (an over-the-rop assumption) chances are small that it will be audible in amplifiers with NFB. I repeat that in my fairly active life with transformers, I have never picked up this phenomenon as worthy of consideration. But now we know. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Leak, Quad, PYE, Dynaco, Radford - Transformer Iron Quality
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