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DIY For Audio
6L6 UL PP valveamp build thread
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<blockquote data-quote="handsome" data-source="post: 1025342" data-attributes="member: 772"><p>the 10R resistor in the cathode is for measuring the bias <em>current</em>, it does not contribute to the biasing. 20 to 70 volts of negative bias is an absurdly wide range. Work out the operating point for the tubes you are using and set your bias to be able to adjust +/- 20% of that value. So for example for a -30V nominal bias you'll want a range of -36V to -24V.</p><p></p><p>The voltage rating of most 24mm pots is about 500VDC. However its the wattage you need to be concerned about - exceeding that rating will burn your pot out.</p></blockquote><p></p>
[QUOTE="handsome, post: 1025342, member: 772"] the 10R resistor in the cathode is for measuring the bias [i]current[/i], it does not contribute to the biasing. 20 to 70 volts of negative bias is an absurdly wide range. Work out the operating point for the tubes you are using and set your bias to be able to adjust +/- 20% of that value. So for example for a -30V nominal bias you'll want a range of -36V to -24V. The voltage rating of most 24mm pots is about 500VDC. However its the wattage you need to be concerned about - exceeding that rating will burn your pot out. [/QUOTE]
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DIY & Tutorials
DIY For Audio
6L6 UL PP valveamp build thread
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