SELECT release_year FROM table_25276250_3 WHERE outputs = "2x Pro Bias, RCA Loop Out" AND notes = "Vacuum tube"
CREATE TABLE table_25276250_3 (release_year VARCHAR, outputs VARCHAR, notes VARCHAR)
ปีไหนที่เอาท์พุตเป็น 2x pro bias, rca loop out และโน้ตถูกปล่อยหลอดสุญญากาศ?
What year were outputs is 2x pro bias, rca loop out and notes is vacuum tube released?