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Audio and Video Talk
Valves / Vacuum Tubes
Single ended triode 45 or 2a3
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<blockquote data-quote="JNouw" data-source="post: 393396" data-attributes="member: 14329"><p>From DIYaudio . . . </p><p></p><p> . . . "In a push-pull amp, the DC current flows through the two halves of the OPT primary , then the magnetic field is canceled.</p><p>Fantastic, do not need an air gap in the OPT core, can also be smaller.</p><p>But the hysteresis loop is a closed curve, not a straight line, regardless of the quality of the core material.</p><p>This means distortion, not only for the non-linearity, but also for the zero crossing of hysteresis loop, the core must be magnetized cycle by cycle.</p><p></p><p>In a SE amp the DC current flows all the time through OPT primary, to avoid saturation of the core, we must add an air gap, the core must be larger.</p><p>But all is not lost, the air gap reduces the area of the hysteresis curve, and also the core is magnetized by the DC component all the time.</p><p>As a result we have a more linear hysteresis curve, and no zero crossing distortion.</p><p>This is a part of "SE Magic"" . . .</p><p></p><p>I have read about this phenomenon before, elsewhere, and I have mentioned it before in my threads here. Any comment?</p></blockquote><p></p>
[QUOTE="JNouw, post: 393396, member: 14329"] From DIYaudio . . . . . . "In a push-pull amp, the DC current flows through the two halves of the OPT primary , then the magnetic field is canceled. Fantastic, do not need an air gap in the OPT core, can also be smaller. But the hysteresis loop is a closed curve, not a straight line, regardless of the quality of the core material. This means distortion, not only for the non-linearity, but also for the zero crossing of hysteresis loop, the core must be magnetized cycle by cycle. In a SE amp the DC current flows all the time through OPT primary, to avoid saturation of the core, we must add an air gap, the core must be larger. But all is not lost, the air gap reduces the area of the hysteresis curve, and also the core is magnetized by the DC component all the time. As a result we have a more linear hysteresis curve, and no zero crossing distortion. This is a part of "SE Magic"" . . . I have read about this phenomenon before, elsewhere, and I have mentioned it before in my threads here. Any comment? [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Single ended triode 45 or 2a3
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