Tube cages are really designed to keep someone or something from getting burned from touching the tubes. Some enhance the looks also. If safety is no concern then just go with what looks better to you.
Some tube cages do vibrate when placed close to the transducers, but most quality amps such as the TAD should not be a problem.
Some tube cages do vibrate when placed close to the transducers, but most quality amps such as the TAD should not be a problem.