Eeyore wrote:

Patrick Turner wrote:

One cannot have distortion cancelling by one tube cancelling that in
another when one is cut off.

THANK YOU !

Basics do matter.

But Graham, once the tubes stop cancelling each other's even order
distortions
when they move from class A to AB, their non linear current behaviour is
utterly
attrocious, and each tube only 1/2 amplicates the signal.

Yet the VOLTAGE outcome across the OPT primary is substantially linear.

So some would say that by means of the SUMMING action of the OPT, there
is cancelling going on.
I am simply saying the summing action merely obstructs the gross non
linearity of currents
from being current in the OPT secondary.

Its Mysterious, this whole simple business.

But any AB amp can be made to be a class A amp if the load value is
simply raised high enough
to prevent cut off occuring, which I define as being the reduction in Ia
to less than 1/10 of
the idle current for each tube.
Cut off could also be described as being where distortion in current
waves in each tube
exceeds 5% to 10%.

Patrick Turner.


Graham