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Audio and Video Talk
Valves / Vacuum Tubes
Armstrong A220 design questions
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<blockquote data-quote="handsome" data-source="post: 803580" data-attributes="member: 772"><p>Is the feedback via R13 not an attempt perhaps to equalise the impedance of the two outputs' of the paraphase inverter? Without R13 V7a essentially behaves like a normal common cathode stage but V7b has a lot of feedback around it - its gain is reduced to unity - and thus a much lower output impedance.</p></blockquote><p></p>
[QUOTE="handsome, post: 803580, member: 772"] Is the feedback via R13 not an attempt perhaps to equalise the impedance of the two outputs' of the paraphase inverter? Without R13 V7a essentially behaves like a normal common cathode stage but V7b has a lot of feedback around it - its gain is reduced to unity - and thus a much lower output impedance. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Armstrong A220 design questions
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