#1
I noticed that my first two preamp tubes have a metal cover on them. What are these for?
#2
Just to protect them, you can take them off without any adverse effects. I'd leave them on, though.
#4
They are on them to block any frequencies they may be picking up.
Leave them on for less hum.
Peavey 5150 combo
1989 Ibanez RG750
MXR 10 Band EQ
Dean MLX
Spider III 15W
Yamaha FG700S

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TC Nova Repeater
#5
^^they're probably the first tubes for both your channels, e.g the tubes that do the most amplifying the signal - to prevent them from picking up noise, they got a shield, that's all...

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