> They also say that IM product do not necessarily drop as drive is
> reduced. It can actually be greater at lower power levels than at higher
> power levels. IM products drop way down at one point midway in the power
> range and then go back up again. They show a graph that is derived
> mathematically and say that most tubes follow the graph pretty closely
> to the predicted IM performance ratios of drive to bias amount.
Yes, I've read that too, but then I've read the opposite.. That statement
above would make my question about using a chain of GG tubes running at
1/10th reduced ratings a poor idea. I'm a little confused cuz I see it
written sometimes that for very linear operation, sometimes stages run at
1/10th their power ratings in class A. Maybe that's for special purpose
receiver high performance preamps or something like that.
Anyone else for comments?
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