Hello I'm flute and guitar player. I do want to play the clarinet. On to my question. How tight can I tune a set of cello strings above standard? I heard cello strings are strong. How tight can cello strings go without breakage?
When you say you're a guitar player, presumably you don't mean classical guitar, otherwise you'd know to be more concerned about damage to the instrument than to the strings. (A classical guitar's strings should never be tuned any amount above concert tuning because that puts too much stress on the body of the instrument and can cause it to warp.) The term for unusual tuning for bowed string instruments, by the way, is scordatura.
The absolute maximum tension would depend on the particular kind of string (gauge, brand, etc.). Pieces that call for tuning down are more common than those that call for tuning up, but pieces that call for tuning up do exist. I don't know of any that call for tuning any string up more than a semitone.