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Audio and Video Talk
Valves / Vacuum Tubes
100 watt push-pull fixed bias amplifier
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<blockquote data-quote="Ampdog" data-source="post: 875032" data-attributes="member: 144"><p>Hi Karel,</p><p></p><p>That is good! </p><p></p><p>If I may be a mite tutorial also for the benefit of others reading here: That compensating capacitor and others are all working together - to at the 'other' side', compensate for the phase shifting effects of small capacitances, mainly at the input stage but also all over the show, trying to keep control, until the amplifier loop gain has fallen to below zero at some supersonic frequency, at which point instability is no longer possible. (Do read up on the internet!) This phase shifting also includes OPT leakage reactance. That C is thus determined for every separate circuit on its own. </p><p></p><p>In Karel's circuit the OPT already seems to be well within control. Let us for now forget about the contribution of the 4 ohm tap in the Gillespie circuit, and the 'funny' divided feedback circuit. Other circuits are suggestions, not prescriptions. End of tutorial!</p><p></p><p>So, Mr Mars, good fortune to you; you know what to do!</p><p></p><p> </p></blockquote><p></p>
[QUOTE="Ampdog, post: 875032, member: 144"] Hi Karel, That is good! If I may be a mite tutorial also for the benefit of others reading here: That compensating capacitor and others are all working together - to at the 'other' side', compensate for the phase shifting effects of small capacitances, mainly at the input stage but also all over the show, trying to keep control, until the amplifier loop gain has fallen to below zero at some supersonic frequency, at which point instability is no longer possible. (Do read up on the internet!) This phase shifting also includes OPT leakage reactance. That C is thus determined for every separate circuit on its own. In Karel's circuit the OPT already seems to be well within control. Let us for now forget about the contribution of the 4 ohm tap in the Gillespie circuit, and the 'funny' divided feedback circuit. Other circuits are suggestions, not prescriptions. End of tutorial! So, Mr Mars, good fortune to you; you know what to do! [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
100 watt push-pull fixed bias amplifier
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