Why not ask Rodger Himself?
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I have an RM9MKII and after 3 hours of play I can't leave my hand on the top plate either. Going on over 12 years now with nary a hiccup. My feeling is if the output tube plates aren't glowing I wouldn't be overly concerned, but you should check your bias with a good digital meter. Couldn't hurt to shoot Roger an email though.