YBA calls "class Alpha," which means that the driver stage is class-A but the output stage is class-A/B
Read more at https://www.stereophile.com/solidpoweramps/831/index.html#84RYQxlcHp4utR9l.99
Read more at https://www.stereophile.com/solidpoweramps/831/index.html#84RYQxlcHp4utR9l.99