> Jim Kearman wrote:
>
>I'm aware that properly matching the tube to the pi network results in best
>efficiency and, presumably, less distortion. But to what extent?
>
Efficiency has nothing to do with amount of distortion. Distortion is
mainly determined by where on the load line the tube is operated and how
linear that load line is.
Although poor efficiency may be an artifact of a good linear amplifier,
it comes about by the operating parameters of the tube.
Proper matching of the output of a tube helps maintain the operating
parameters in the linear region of the load line.
Loading an amplifier heavier than where maximum output occurs helps to
keep the operating region in the more linear portion of the load line.
In other words heavier loading helps keep the operation down below the
upper curve of the load line where flat topping starts to occur, but at
the expense of some efficiency.
73
Gary K4FMX
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