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In Reply to: RE: "Single ended class A" posted by genungo on August 26, 2014 at 20:49:25
You can have push pull class A. Who's calling who dumb
Alan
Follow Ups:
There's A1 with no grid current, and A2, where significant grid current is drawn. Also, combinations of the two (A1 up to certain power, then A2).
The simple definition of Class A is when the current never cuts off.
One could build an amplifier where all the tubes work in Class A and still end up with a distorted mess.
Most of the examples in the text books of Class A are "Linear Class A" (my words) where the tubes are biased in the middle of the most linear part of the dynamic curve and only allowed to operate within the most linear part of that curve.
That is my definition of Class A. I have caught a lot of flak for that.
In the end I guess it's Class A as long as the current never shuts off but who wants to waste time talking about bad Class A?
As an aside, some of the old books talk about the "cutoff region". This is the region approaching cutoff (but before reaching it) where the operation becomes very non-linear. And those books define Class A operation as not operated in the cutoff region, but only in the linear region.
So in the end you have to ask, "What kind of Class A?".
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I think that when when engineers like Nelson Pass bother to say "single-ended class A" instead of simply saying "single-ended", they are not being dumb. They are simply trying to be very specific.
Well, "...how little audiophiles know..." is what hahax said, right?Hey, I know that knowing too much creates just as many problems as being dumb does. That's why I choose to stand proud...
My point is, audiophiles aren't necessarily using the term "single-ended class A" because they know "little". More likely, they are using it because those who know a lot use it.
Edits: 08/27/14
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