General Asylum

RE: You're welcome to believe what you pleas

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In Reply to: RE: You're welcome to believe what you pleas posted by Tre' on July 28, 2018 at 22:32:12

I feel like you will think I'm picking on you.

You made statements not supported by fact. To wit:

If it can "leave Class A" to produce more power then it's not a Class A amplifier.

That's a direct quote from Pass.

I hope you take this in the spirit of good will. The spirit in which I intend it.

What I now understand is there are degrees of performance once you enter the state where the devices no longer switch - and that continues to improve with higher levels of bias.

Follow Ups:

RE: You're welcome to believe what you pleas - Tre' 07:02:57 07/29/18 (0)
"What I now understand is there are degrees of performance once you enter the state where the devices no longer switch - and that continues to improve with higher levels of bias."

Yes, but only to a point. The bias level can only go as far as full Class A otherwise the device will run into saturation (ie; non-linear behavior much like cutoff but at the other end of the dynamic operating curve).

Only the center part of the of the operating curve is linear. It becomes non-linear at each end. The idea is to bias in the middle of the linear part, ie; Class A.

Please note that I have made no attempt to address trick circuits such as the one Nelson mentions in the link.

"In 1991 Pass Labs developed a hybrid class topology which paralleled a push-pull Class A output stage with a current source which biased it into single-ended Class A. The Aleph 0 amplifier operated as a single-ended Class A amplifier to its output rating of 75 watts into 8 ohms, and at currents beyond that it continued to deliver current as a push-pull Class A circuit."

My comments only address the behavior of a basic single ended or push pull amplifier not a trick circuit that somehow combines the two as described above by Nelson.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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