Krell anticipator circuits of the 1990s

Where’d this “anticipator circuit” come from? 
I also don’t think any “green revolution” is impacting class A amplifier design and production. Anymore than it is driving development or sales of  class A/B,D etc….

As I see it, Krell has been attempting to improve their amplifiers by innovation which includes removing/addressing issues with class A amplification while maintaining the benefits. Heat, and efficiency being the problems with fully class A.

I doubt Krell is just tossing about ad claims to sell product. They are not a mass market company looking to move amps and ramp up production.

I do not, I am no engineer, think the OP bass drum analogy accurately describes what Krell is doing here. It is a sort of straw man. The process is patented. It can be proven on the bench and to the ears. It either delivers its goal or it does not.

It is not as some seem to think, a secret circuit that can tell the future. In the end does it deliver on its promise?

https://www.hificlube.net/media/11276/krell_ibias.pdf 

@johnlnyc    Thank you for this input.

As in my OP, the anticipator circuit is claimed to monitor the output from the pre-amp and adjust the bias quickly enough so that the change has taken effect before that output is amplified.  A tall order I think.

At the introduction of the FPB series environmental issues were discussed.  My KRS200s draw more than 1kW per side.

Just because an idea is patented doesn't mean it is effective.

As a manufacturer previously claiming the benefits of pure Class A, if they wished to sell FPB prorduct it was encumbent on Krell to claim they had overcome the disadvantages of Class AB designs.

Yes the circuit could be proven on the bench but it has not been.  The time that the circuit takes to adjust the bias has never been revealed or found.  To that extent it is a secret circuit.

The paper you publish does not speak of the time it takes to change the bias.

I never said it was claimed the circuit could tell the future.  It does claim it can change the bias quickly enough in response to changes in the signal.  We don't know if that claim is true or not.

Krell has never been forthcoming with any of their circuit designs and schematics. They also came out with sustained plateau bias long before the FPB series came out.

@invalid    I am aware of these facts.

Not so long.   I believe the first variable bias Krell was the KSA300S, launched in 1994.  The first of the FPB series started in 1997.

The krell audio standard was the first variable bias amplifier krell made, it was their flagship amplifier at the time 1993 I believe.