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DIY & Tutorials
DIY For Audio
6L6 UL PP valveamp build thread
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<blockquote data-quote="fredeb" data-source="post: 1026545" data-attributes="member: 13623"><p>Yesterday I managed to wire up 8ohm loads . Set AC Balance using 200hz signal and a voltmeter with 100nF cap on the grid of the output tubes , as per Byrith's 2nd method of setting AC balance . Then I biased the output tubes to 75% total dissipation , and finally set DC balance between cathodes of output tubes as close as humanly possible to 0V . Managed to set to ~ +-0.03V .</p><p></p><p>Amazingly , hum disappears when AC balance , bias and DC balance is set perfectly .</p><p></p><p>The amp sounds very good , I spent quite a couple of hours listening to various types of music . Bass is quite defined , and solid .</p><p></p><p></p><p></p><p></p><p><img src="https://uploads.tapatalk-cdn.com/20201116/5cc23263a74f361890d1ba30e05aa6d8.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="fredeb, post: 1026545, member: 13623"] Yesterday I managed to wire up 8ohm loads . Set AC Balance using 200hz signal and a voltmeter with 100nF cap on the grid of the output tubes , as per Byrith's 2nd method of setting AC balance . Then I biased the output tubes to 75% total dissipation , and finally set DC balance between cathodes of output tubes as close as humanly possible to 0V . Managed to set to ~ +-0.03V . Amazingly , hum disappears when AC balance , bias and DC balance is set perfectly . The amp sounds very good , I spent quite a couple of hours listening to various types of music . Bass is quite defined , and solid . [IMG]https://uploads.tapatalk-cdn.com/20201116/5cc23263a74f361890d1ba30e05aa6d8.jpg[/IMG] [/QUOTE]
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DIY & Tutorials
DIY For Audio
6L6 UL PP valveamp build thread
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