Ive got four.
& I know about:

is there anything i need to do besides just yankin' em on out?
Well it's a 8 ohm cab so with the tubes removed shouldn't I set the impendance of the amp to 4?
Yes you should.

Also, what amp is it?
The Laney Thread are big and clever. No exceptions.
dont worry, its fairly simple

Tubes are like light bulbs, shove them in and out as you like

the worst that can happen is, electrocuting yourself to death

i hope this helps
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