Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_30 (_number_tubes VARCHAR, audio_amp VARCHAR)
### Question:
Name the # tubes with audio amp of x
### Answer:
SELECT _number_tubes FROM table_name_30 WHERE audio_amp = "x"