#1
obviously they are to 'guard' the tubes, but are they for any other purposes such as heat shielding?

i'm talking about preamp tubes, btw
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#4
Preamp tubes it's mostly shielding. If you see them (or spring-like contraptions) on power tubes it's so they don't fall out because of vibration...
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#5
they can hold a fan if its over heating
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