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Audio and Video Talk
Valves / Vacuum Tubes
Armstrong A220 design questions
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<blockquote data-quote="El Sid" data-source="post: 803576" data-attributes="member: 18550"><p>Thanks so much Ampdog! I am happy to get a response from the boffins' boffin. :notworthy:</p><p></p><p>I did not recognise it as a paraphase phase splitter - I was only familiar with the simpler paraphase type where the output of the first valve goes through a voltage divider to act as the input of the paraphase valve. So I went and did my homework, so now understand what many call the floating paraphase.</p><p></p><p>The output impedance-reducing feedback via R13 (you are correct about its number) I would never have worked out by myself! You are right about the high anode load resistors - R9 & 10 are actually 220K, even higher than you suspected, probably making it even more of an issue and hence requiring the feedback to address the output impedance?</p><p></p><p>Of the types of phase splitter - cathodyne, paraphase and long tailed pair (that I know of), which do you prefer in your designs and why?</p></blockquote><p></p>
[QUOTE="El Sid, post: 803576, member: 18550"] Thanks so much Ampdog! I am happy to get a response from the boffins' boffin. :notworthy: I did not recognise it as a paraphase phase splitter - I was only familiar with the simpler paraphase type where the output of the first valve goes through a voltage divider to act as the input of the paraphase valve. So I went and did my homework, so now understand what many call the floating paraphase. The output impedance-reducing feedback via R13 (you are correct about its number) I would never have worked out by myself! You are right about the high anode load resistors - R9 & 10 are actually 220K, even higher than you suspected, probably making it even more of an issue and hence requiring the feedback to address the output impedance? Of the types of phase splitter - cathodyne, paraphase and long tailed pair (that I know of), which do you prefer in your designs and why? [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Armstrong A220 design questions
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