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DIY For Audio
6L6 UL PP valveamp build thread
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<blockquote data-quote="handsome" data-source="post: 1023181" data-attributes="member: 772"><p>Not sure what version you are building but - if you are using fixed-bias then 6L6 maximum grid resistance (that's <em>total resistance</em> at grid to AC ground not value of the grid resistor) is 100k see the datasheet. More than that and you risk runaway in your output tubes. So if you are using a 12AX7/ECC83 to drive the 6L6s it will take a bit of strain (more distortion) into such a low resistance. This is one of the reasons why the Mullard/Leak's use cathode not fixed bias and 12AX7 drivers. If you want to use fixed bias you'll need to use a tube with a lower plate resistance.</p></blockquote><p></p>
[QUOTE="handsome, post: 1023181, member: 772"] Not sure what version you are building but - if you are using fixed-bias then 6L6 maximum grid resistance (that's [i]total resistance[/i] at grid to AC ground not value of the grid resistor) is 100k see the datasheet. More than that and you risk runaway in your output tubes. So if you are using a 12AX7/ECC83 to drive the 6L6s it will take a bit of strain (more distortion) into such a low resistance. This is one of the reasons why the Mullard/Leak's use cathode not fixed bias and 12AX7 drivers. If you want to use fixed bias you'll need to use a tube with a lower plate resistance. [/QUOTE]
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DIY & Tutorials
DIY For Audio
6L6 UL PP valveamp build thread
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