Class A Power in A/B amplifiers?

Hey Abraxalito slumming it again??

Cheers George

I have experimented with different bias currents in my Class A/B Integrated Amp and found that higher values provided significant improvements in sound quality, especially at low volume. Heat buildup becomes a limiting factor.

The "Leaving Class A" article by Nelson Pass may be of interest.

https://www.passlabs.com/technical_article/leaving-class-a/ 

George - yep, and the old torch bearer is yapping at my heels! Eeeek!

Is there a general industry standard for the amount of Class A power in Class A/B amplifiers?For instance SimAudio has always touted that they run Class A for the first 5 watts.

No. If the amp is only 1/4 or 1/2 watt before it goes into B operation its still considered class AB. Some amps out there have what is marketed as 'enriched A' operation where they have 20% or so of full power in the A region, but that is only marketing; such amps are still considered class AB. There is no such thing as 'A/AB' unless there is a switch to differentiate the two.

Take a look at Coda's offerings.  Many of their amps are offered in different versions, with varying degrees of Class A operation.