I have Classic 80s in my Egnater Tourmaster cab, 2 x 12's. They do well with the Mark series to my ears. I also have a Marshall 2 x 12 that has GT75s. They are a bit to crisp/thin for me on the MKV. I run a stereo rig and funny thing is that the 75's sound better with the Rectifier than the MKV. So it works out well. The Classic 80's do the Mark Series amp leads better IMO. The Celestion GT 75s do the rectifier chug better but since they are more peaky, the amp sizzle comes thru more. I think part of the Rectifier sound is the high end sizzle, especially when playing with a thumping bass player. Good chunky riffs where you and the bass are on the same lick, the low end of the bass is filled out in the mids and highs by the sizzling Rectifier sound. Playing alone/bedroom jammer they sound too bright, in a band context, just right....