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Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
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<blockquote data-quote="Ampdog" data-source="post: 840123" data-attributes="member: 144"><p>One little matter here:</p><p></p><p>You have no NFB, despite R21. The large 1000?F cap across R18, if it is indeed there, will short all signal on that cathode to ground. Thus R21 actually feeds into a short. And for triode output, R15-R16 is on the high side; 150 - 220 ohm would be ample! Not criticisms, just stating normal practice.</p><p></p><p>Also, do not worrry about the 415V, not so insane. Some similar circuits (the Williamson itself use all of 450V. (In the Hall? I use 600V - but that is another matter.) As long as no anode dissipations are exceeded, stay with 415V.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 840123, member: 144"] One little matter here: You have no NFB, despite R21. The large 1000?F cap across R18, if it is indeed there, will short all signal on that cathode to ground. Thus R21 actually feeds into a short. And for triode output, R15-R16 is on the high side; 150 - 220 ohm would be ample! Not criticisms, just stating normal practice. Also, do not worrry about the 415V, not so insane. Some similar circuits (the Williamson itself use all of 450V. (In the Hall? I use 600V - but that is another matter.) As long as no anode dissipations are exceeded, stay with 415V. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
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