Own all three MC2 (EL34), MTL (6L6) and HR (6L6).
Thumpy as fuck, all of them. The gain just keeps going up and the clarity and attack never goes away. The sound in the room through a 4x12 is just incredible.
If you don’t have a strong picking attack/accurate picking hand, be careful.
Never played a skeleton key.
What are you trying to do that your skeleton key can’t do, what type of tone are you after and what bands/style of music you want to achieve?
MCII - Hard rock to some metal
MTL - imagine the most perfect amp for 80s thrash and then some
HR - just absolutely crushing and more gain and just sheer metal ness than you could ever imagine…EVER.