arkohandler said:
I'm definitely torn between the two. I wish I had the money to just buy both and call it a day. I really have enjoyed this topic yet find myself still undecided on what I want to do.
Both amps are great amps. The choice may come down to what style you play. If you need an all around great amp, the Mark V is for you. If you will spend the majority of your time playing high gain hard rock/metal, the Mark IV would be a wise choice.
As far as the tonal differences, the Mark V's Channel 3 "Mark IV" doesn't seem to replicate the Mark IV's lead channel IMHO. After playing at all different wattages, I found the "Mark IV Extreme" setting to come closest to the actual Mark IV lead.
Keep in mind, the Mark V doesn't have a "lead drive" control (the Mark V was created with the "lead drive set to 7.5, which is typical of many players settings), but as for my playing, I use all different lead drive" settings. Also, if you wanted to use both 6L6s and EL34s at the same time, you need a Mark IV.
One option on the Mark V that doesn't seem to get much attention is the fact that it has tube rectification which can add some dimension to your tone. I tend to prefer tube rectification on my clean channel.
Overall, both amps are great at what they do. The Mark V has rounder, deeper cleans, and a higher gain Rhythm/Channel 2, and the high gain (IIC+, IV and IVX) are very convincing, but are different than the amps they are named after, but to get a great clean, great Rhythm and good high gain tones, a Mark V or Triaxis are the most well rounded Boogies with plenty of options to keep you busy.