On Jul 18, 2006, at 7:10 AM, Tom W8JI wrote:
>> Here's my thoughts. First, an amplifier with output
>> devices (note-
>> tubes or solid state) will have a certain absolute maximum
>> output
>> power capability. There is a point at which the tube(s)
>> cannot produce
>> additional RF. If an attempt to exceed that level is made
>> it
>> merely flat-tops and creates trash in addition to the
>> desired signal.
>
> That "trash" starts at anything over zero watts Ed, and it
> can get better and worse as power is increased. Transistors
> of course limit with a much more defined change in transfer
> characteristics than tubes, and the angle of the slope
> actually controls the distortion....not the fact the
> transfer characteristic diverges from a straight line.
So why do tube manufacturers publish characteristic curves? As I see
it, when the slope of a constant-current line is changing, distortion
is happening because the transfer characteristic is no longer constant.
> .,.,
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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