[quote name='Marvin' timestamp='1378221075' post='2197242']
An electronics engineer (an authorised service engineer for the likes of Yamaha and Ampeg) explained to me the difference between digital, solid state and valve...and it made complete sense why people say class D is good but just lacks something. Suffice to say I won't be buying one in a hurry.
He also explained why they can be unreliable.
Just to add, I'm probably one of the weediest, skinniest blokes on earth and I've also got a bad back due to work. However, I don't have any problems moving my Ampeg cab around, it weighs over 35kg. COME ON YOU LOT, MAN UP!!!!!
[/quote]
A switched mode power supply is probably more reliable than something with valves in, more so when they are being lumped around. However there are books on Class A, A/B, D etc so probably not worth getting all hot and bothered about it on here (electronic degree here so some knowledge of the internal gubbins). Each to their own.