Name the rectifier for Det/Pre-amp of x and # tubes of 4
CREATE TABLE table_name_69 (rectifier VARCHAR, det_pre_amp VARCHAR, _number_tubes VARCHAR)
SELECT rectifier FROM table_name_69 WHERE det_pre_amp = "x" AND _number_tubes = "4"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_69 (rectifier VARCHAR, det_pre_amp VARCHAR, _number_tubes VARCHAR) Question: Name the rectifier for Det/Pre-amp of x and # tubes of 4 [/INST] SELECT rectifier FROM table_name_69 WHERE det_pre_amp = "x" AND _number_tubes = "4" </s>