Hi everyone, from what I've read here there are some quite knowledgeable people here. My issue is with my Mesa Boogie road king II, when I bought this amp (used) it sounded poor, very little gain and no high end on the 3rd and 4th channels. From what I gathered this is a preamp tube issue. So I started checking the tubes and when I removed the case the glass tip of the tube was broken and it ended up cracking when I attempted to remove it. Now im left with the plastic base of the tube plugged into the socket. Is it safe for me to try and remove it myself, I would prefer not to lug it to the shop seeing as how it's 100 lbs. Another question : is okay to operate this amplifier with the metal covers off the preamp tubes? I find it daunting to get it on the tube with the spring on there Many thanks!