What is a rectifier (as in Mesa dual rectifier)?

NelsonP

Good article on rectifiers here, in case you ever wondered what they are...
http://proguitarshop.com/andyscorner/rectifiers-explained

Maynehead

I've always thought it was a device that rectifies your puny little jazz chords into AWESOME METAL POWER CHORDS!

And the more of them you have in your amp the more awesome the amp becomes.

timmysoft

Maynehead said:

I've always thought it was a device that rectifies your puny little jazz chords into AWESOME METAL POWER CHORDS!

And the more of them you have in your amp the more awesome the amp becomes.

Correct. 

prowla

They automatically fix your mistakes.