As I' m now taking up playing tuba again after many years, I have a problem.

Much of the brass band music is written in treble clef. To be able to play this music on tuba I need an explanation on how to read/transpose the music, in a practical way, to bass clef.
I' m used to play bass clef on tuba, but I can read treble clef notes, as I have also played trumpet. I just don' t know how to play them on tuba.

I' m sorry if this is a too trivial question for this forum.

Can someone help me on this?

Best regards