Class A Power in A/B amplifiers?

believing that Class A was the SHIT! ... But I came to find that slew rate & wide band frequency response under punishing conditions is a far better resume

You can't state that unless it's the same amp your comparing the different Class-A bias with.

You also need to listen to the same amp (Gryphon Antillion) as I stated above with all those parameters you mention, but that is switchable in Class-A biasing low med and high, and then state it doesn't matter much, if it's in high class-A bias compared to low or even medium.

Cheers George  

If the amp has feedback, you’ll probably not be able to tell anything about class A or AB.

@georgehifi seemed to have ignored the point🤦‍♂️

NO! this is bad information and definitely not correct
I have built many Class-A’s (even a massive water cooled one), I and friends could tell if they were in low bias or high bias, with feedback applied, using global or local, and using matched complimentary outputs.
And if you don’t believe me ask Nelson Pass one of the foremost Guru’s of Class-A amplification that neither of you could hold a candle to, he’ll set both of you straight.

To me, there is no proof class A is consistently or even broadly better than any other class of amplifier when each class is well executed.

Of course Class-A is better if made correctly.

Once a low bias A/B amp leaves it’s low Class-A bias you get cross-over distortion. "NO" crossover distortion is better to listen to in anyone’s language, it’s one of the worst distortions there is, if it were second harmonic distortion then you could forgive it https://ibb.co/VpFSzSz

Do yourself a favor (here’s your proof) and listen to a Gryphon Antillion with switchable bias on the run while listening low, med, high (100w), if you can’t hear the difference then give it away and take up something else.
https://gryphon-audio.dk/shop/power-amplifiers/antileon-evo-stereo/
.

The first is that you can bias the device in its most linear region.

This is correct, and why the "better" higher power Class-A’s use up to 24 sometimes 48 even 64 complimentary outputs as in the Threshold Stasis SA/12E monoblocks, so as to only use the "most linear part" of each transistors curve. https://ibb.co/d7BKwzL

The SA/12e, being fully class-A from input through to and including output stage, draws its maximum power from the line at idle—about 1000W for the pair.

https://www.stereophile.com/content/threshold-stasis-sa12e-power-amplifier-page-2

Cheers George

abraxalito

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

Yeah I got bored over at the other place, much more fun over here, for breaks giving **** to the snake oilers and voodooist like fusers, etc etc.
That sort of snake oil stuff is kept under control over there, so there no real dog fight action.
But I must admit it’s starting to become chronic here, as too many can see 10000’s% of profit selling re-badged 10cent fuses for >$150+ and having no overheads doing it!

Cheers George

Hey Abraxalito slumming it again??

Cheers George

Most "high biased" >100w amps are around 5w Class-A,
Unless you go Gryphon Antillion which has 3 X switchable bias up to 100W!!! Class-A and is 150w A/B

The Class-A heat factor "goes up exponentially" the more Class-B you have.

So two amps both with 5w of Class-A each.
One is 50w-a/B the other 200w-a/B. The 200watter will be 4 times hotter "at idle" than the 50watter even though they both only have 5w class-A.
Hope that explains it??

Cheers George