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Audio and Video Talk
Valves / Vacuum Tubes
826 -> GM70 AMP Design
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<blockquote data-quote="Ampdog" data-source="post: 522885" data-attributes="member: 144"><p>JRobson,</p><p></p><p>One cannot have a CCS in series with the transformer - or in series with anything. The electronic equivalent of a CCS is an infinite (or at least very high) resistance. Thus any transformer etc. in series with it will have negligible signal current through it; the CCS will simply keep the current constant irrespective of what the driver valve is trying to do.</p><p></p><p>If you look up schematics, you will find that a CCS is normally used to keep d.c. out of a transformer, i.e. an anode is capacitor-coupled to the transformer. That way the valve has an infinite impedance d.c. anode load, and sees only the transformer as signal load. (Much depends on the frequency characteristic of the CCS. Not all CCSs will be such over the whole audio band unless designed that way - which can be quite a chore.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 522885, member: 144"] JRobson, One cannot have a CCS in series with the transformer - or in series with anything. The electronic equivalent of a CCS is an infinite (or at least very high) resistance. Thus any transformer etc. in series with it will have negligible signal current through it; the CCS will simply keep the current constant irrespective of what the driver valve is trying to do. If you look up schematics, you will find that a CCS is normally used to keep d.c. out of a transformer, i.e. an anode is capacitor-coupled to the transformer. That way the valve has an infinite impedance d.c. anode load, and sees only the transformer as signal load. (Much depends on the frequency characteristic of the CCS. Not all CCSs will be such over the whole audio band unless designed that way - which can be quite a chore.) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
826 -> GM70 AMP Design
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