Krell anticipator circuits of the 1990s

Indeed.  If they don't tell us the details then we can be pretty sure it's a pig in a poke.

It may even be the iBias circuit is a spoof.  If there is anything good to tell then they will tell it.  They are protected by patents, after all.

If it sounds impossible then it probably is impossible.

It's interesting that the subject of my initial post:1990s anticipator circuits, continues into new Krell products being launched right now, nearly 30 years later.  Brought my subject right up to date.  Maybe they're still selling the same old tat.

Not at all like Krell's first product, the KSA50 which was and remains wonderful.  I still use the one I bought nearly 40 years ago, in my second system.  Not even a service required, although use has been sparse these 30 year.

I still don't believe it.

+1@jasonbourne52,

Qualified Krell service engineers have not been able to explain to me how it can work.

In my opinion they could not explain how it works because they knew it was marketing baloney.

Example of marking baloney in audio see below:

This feature plateau biasing circuit allows for the Krell FPB 600 amplifier to have Class A bias output without all the wasted electricity and heat. Really?

This is all very unsatisfactory and in the result I continue to use my KRS200s.

I agree, keep the Krell KRS200s if want new ''real'' class A amps see Pass XS300 mono block amps, they will give you all the heat you need to keep your English castle warm. 😎

Mike

https://www.passlabs.com/product_tags/class-a/

@dlcockrum - My friends amplifier is a Krell KSA-100S.  It has sustained plateau biasing with four lights on the front to indicate the various levels.  Not quite the same implementation, but similar concept.

There is opto-couplers in my ksa 300s amp. It will give you 300 watts of class A power for only a little while as the heat sinks aren't big enough to sustain it. If it gets to a certain temperature it will be class A/b on the top two bias levels until the temperature comes back down.

I heard  a set of bryston  7b monoblocks  compared  to the krell fbp600. I am not s bryston  fan but I found them to sound much better in that system  that day. A friend used to have a set of krell kma monoblocks  I really liked them. I never liked the 600.