Why do I like Class AB better than Class A?


So I just purchased a Plinius SA 100 MKIII, and have had 2 listening sessions comparing both with the toggle switch. To me clearly the AB is more detailed and focused, the A is warm but a little fuzzy and bloated, although I would give it a slight nod on just vocal songs. Am I just not use to the sound as this is my first A amp or have I not let it properly warm up for class A (1hour or so).
Don't get me wrong, i love the amp, great bottom end slam but I don't hear the holy grail from Class A. Thanks in advance for the input guys.
barfbag
I owned the SA100MKIII and preferred class A over AB, it was really liquid and had better weight and a deeper soundstage, also more of an intimate and revealing inner glow quality.

not quite tubes but as close as I have heard from SS.

no contest in my book, on Maggie 1.6 btw...
Clarification on my above post. I left my Plinius SA 100 MK III on 24/7 in A/B but when I switched it to class A it took at least 20 minutes to reach the sound I desired.
"I don't hear the holy grail from Class A. Thanks in advance for the input guys."

You should be if all is functioning fine, Class A should have a 3D quality instead of 2d like the A/B would have in comparision.

"the A is warm but a little fuzzy and bloated"

This could happen if the power supply is not up to task, as Class A mode will tax the power supply much more and bring it closer to satuartion point than A/B will, this satuation results in restricted dynamics, soft (bloated) bass loss of transparency. Remeber the power supply is the engine room of the amp.

Cheers George

Hey, thanks for all the feedback. I have Snell type AIII's, now I know there not very efficient but this amp certainly has brought more bottom end slam than my BAT. The rest, AIFF,Pure music, MacMini, Wyred4sound DAC 2, Aesthetix Calypso Pre with Nos Tubes, oh and dedicated 20 amp outlets plugged straight in. I was hoping someone would tell me I would need to get used to the class A sound. I will let her warm up more than the hour I usually give it and see what happens.
Most transistor gear I have seen really have long warm-up times- 24 hours or more.

Theoretically class A gives you lower distortion. When you remove distortion, the amp should sound smoother and more detailed as distortion can result in harshness and obscures detail due to the ear's masking rule.

Now when you get more detail, one of the things that happens is that there is more room ambiance that shows up. There is more of the acoustic signature around each instrument. This can make the amp seem to have less image specificity, until you realize that the image is being presented with more of the ambiance around it intact.