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RE: Wasn't an experiement in those terms.

Tubes with a "rattle" are most likely in damaged condition.

If you have access to an emissions type tube tester, it can at least tell you if the tube is dead, shorted, or possibly still usable. Even better is a transconductance tester, which will show you the tube's real state of health (or lack thereof).

If you can't get access to a tester, try measuring the resistance of the filament between pins 1 and 4 (the two "fat" pins). This should be a low resistance value, a matter of an ohm or two, with a cold filament.
An "Open" reading means that the filament is broken.

(Look for little bits of filament wire rolling around inside of the tube's envelope).

Also check for any resistance between 1+4 and pin 2, and to pin 3, and between 2 and 3; these should all read as open. (or as infinity).

HTH

/ed B


real radios glow in the dark


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