The correct spelling for the past tense of the verb "throw" is "threw" (θruː). However, the phrase "threw balance" might be a misspelling or an incorrect usage, as "throw balance" is not a common phrase. It is important to check the context and intended meaning of any phrase to ensure the correct spelling and usage. Phonetic transcription can aid in understanding the pronunciation and spelling of words, such as the vowel sound in "threw" represented by the symbol ʌ.