Name the det/pre-amp with # tubes of 4 and rectifier of x
CREATE TABLE table_name_56 (det_pre_amp VARCHAR, _number_tubes VARCHAR, rectifier VARCHAR)
SELECT det_pre_amp FROM table_name_56 WHERE _number_tubes = "4" AND rectifier = "x"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_56 (det_pre_amp VARCHAR, _number_tubes VARCHAR, rectifier VARCHAR) Question: Name the det/pre-amp with # tubes of 4 and rectifier of x [/INST] SELECT det_pre_amp FROM table_name_56 WHERE _number_tubes = "4" AND rectifier = "x" </s>