"Ian Thompson-Bell" wrote in
message
Arny Krueger wrote:
"Ian Thompson-Bell" wrote in
message
wrote:
"In a word: YES...
"The answer is rooted in the harmonic content that the
device can pass or generate..."
Continued: http://easyurl.net/TubesTubes
There is a lot missing from this article. First, it is
triodes alone that generate pleasing 2nd harmonic
distortion. Pentodes generate odd harmonics just as much
as transistors do.
It is a myth that triodes generate only even harmonics.
In fact, tubes have basically exponential response,
which leads to the generation of a wide variety of
orders of distortion, both odd and even.
No, pentodes have an exponential transfer function like
BJTs do, but triodes have a simpler ^3/2 transfer
function which produces a different harmonic content.
In my book, what you call ^3/2 transfer function is just another flavor of
exponential.
A ^3/2 transfer function can be read as the square root of cubed, which is
nothing like pure even order or pure second order.