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Audio and Video Talk
Vinyl
6L6GC Single Ended amplifier with first attempt OPT
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<blockquote data-quote="handsome" data-source="post: 70935" data-attributes="member: 772"><p>the 'classic' mu-follower takes the output from the upper tube's cathode resulting in a low output impedance <em>plus</em> a very high load for the lower tube. since the upper tube is a constant current source the load it presents to the lower tube tends toward infinite - giving a near horizontal load line for the lower tube - this very high load drastically reduces distortion on the lower tube. however, taking the load off the lower tube's anode can nullify this; the lower tube is now feeding an input resistance much smaller than it's load. the true load on the lower tube is this input resistance (100k in this case) in parallel with the active load of the upper tube. thus the load on the lower tube has been reduced from very high to rather low (relatively speaking of course) and the low distortion of the active load has been lost. If one is to use the lower output of a mu-follower one should direct couple it to the next stage. but of course if sounds good.........</p></blockquote><p></p>
[QUOTE="handsome, post: 70935, member: 772"] the 'classic' mu-follower takes the output from the upper tube's cathode resulting in a low output impedance [i]plus[/i] a very high load for the lower tube. since the upper tube is a constant current source the load it presents to the lower tube tends toward infinite - giving a near horizontal load line for the lower tube - this very high load drastically reduces distortion on the lower tube. however, taking the load off the lower tube's anode can nullify this; the lower tube is now feeding an input resistance much smaller than it's load. the true load on the lower tube is this input resistance (100k in this case) in parallel with the active load of the upper tube. thus the load on the lower tube has been reduced from very high to rather low (relatively speaking of course) and the low distortion of the active load has been lost. If one is to use the lower output of a mu-follower one should direct couple it to the next stage. but of course if sounds good......... [/QUOTE]
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Audio and Video Talk
Vinyl
6L6GC Single Ended amplifier with first attempt OPT
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