Hi, Somehow I missed that you had responded recently. Anyhow two things come to mind...one class B PP is only useful IMO in modulating AM ham radio transmitters. Class A and AB are quite suitable for high fidelity reproduction. My preference is class A triodes and class A with U/L if pentodes are used. My experience has been that AB operation seems to change the sound somehow that I can't measure but can hear. On another note the fact that the guy mentioned ignored the truth and insisted in the incorrect information seems to be a thing that many others have been doing in the media and dare I say politics.