Why do I like Class AB better than Class A?

I'm sorry, maybe I'm slow or missing something. but your initial post said that you compared both with a toggle switch. Compared both what? I only saw one amp. So, my initial reaction without benefit of knowing which two amps you are talking about is that you compared apples to oranges. The amps were either not rated the same or they were in totally different price points. Like comparing a $10,000 amp with a $400 Yamaha 100wpc amp. I don't know what you compared.

Enjoy

marketing. I would bet you a lunch that the Plinius is biased class A up to a particular bias point and even within class A/B and when you flick the switch the bias is reset to a higher bias point.

enjoy

Got it. Still once you turn a transistor on, it is on. It can be turned on at a really low bias point, but, it is still on. Then you can really turn it on at a much higher bias point where you are cooking at full rated output without an input signal.

This is marketing and semantics. But on is on. Some devices are biased such that they aren't turned on until the AC signal is passed through it. Others are biased such that they are turned on with DC bias with or without an AC signal passing through it. Again, many of the amps I have tested and repaired state they are class A on the specifications and are rated at 50, 100 150,etc. wpc. This does not mean that they are biased at the rated output capacity. They are biased on at 2 watts or 5 watts of 20 watts etc.

also, thanks for the clarification. I didn't know this amp had a switch that altered the internal circuit bias. However, to be clear, all it did was change the bias point from a lower to higher output driver bias. Which is a good circuit design idea as long as you have the power supply capacity and the proper heatsinking for the output drivers. Full output class A is wonderful for those cold days and nights when I want an extra space heater. Tube amps are also good for this.

enjoy