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Audio and Video Talk
Valves / Vacuum Tubes
Sansui AU111 Valve Amplifier
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<blockquote data-quote="Family_Dog" data-source="post: 126321" data-attributes="member: 82"><p>This is what Isao Asakura had to say re the coupling caps:</p><p></p><p>"Higher values of coupling caps are supposed to improve the low frequency characteristics. Well, you can do that on non NFB amps with little considerations. However, the AU-111 applies the global NFB within the power amp section. If this is a case, the combination of coupling caps (in each amplification stage) under the global NFB need to be maintained with the certain values - otherwise, the phase in low frequency will be shifted at the end. This is the reason why you need to use the 0.3uF coupling cap."</p><p></p><p>Isao Asakura was part of the original Japanese design team who designed the AU-III.</p><p></p><p></p><p>Reference: http://sansui1944.websitetoolbox.com/post?id=1412218</p><p></p><p></p><p>-F_D</p></blockquote><p></p>
[QUOTE="Family_Dog, post: 126321, member: 82"] This is what Isao Asakura had to say re the coupling caps: "Higher values of coupling caps are supposed to improve the low frequency characteristics. Well, you can do that on non NFB amps with little considerations. However, the AU-111 applies the global NFB within the power amp section. If this is a case, the combination of coupling caps (in each amplification stage) under the global NFB need to be maintained with the certain values - otherwise, the phase in low frequency will be shifted at the end. This is the reason why you need to use the 0.3uF coupling cap." Isao Asakura was part of the original Japanese design team who designed the AU-III. Reference: http://sansui1944.websitetoolbox.com/post?id=1412218 -F_D [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sansui AU111 Valve Amplifier
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