Bombardons, but as otherwise configured (5)

I believe the answer is:

tubas

I'm a little stuck... Click here to teach me more about this clue!

'bombardons' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?

'but as otherwise configured' is the wordplay.
'but as' can be anagrammed to 'TUBAS'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for tubas that I've seen before include "What some musicians" , "Large brass instruments" .)

I've seen this clue in the Sydney Morning Herald.

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