A method for manufacturing a tube (16,16') of metal, wherein the tube (16,16') comprises an outer surface and an inner surface (14,14'), the method comprising the steps of, providing an outer tube (5,5') of metal with an outer surface, an inner surface (17,17'), an outer dimension and an inner dimension, providing an inner tube (1,1') of metal with an outer surface (2,2'), an inner surface (14,14'), an outer dimension and an inner dimension, wherein providing the inner tube comprises the steps of, - providing a hollow of metal, - drawing the hollow of metal through a second drawing die having an inner tool surface forming the outer surface of the inner tube into the inner tube, wherein the tool dimension of the inner tool surface of the second drawing die is chosen such that the outer dimension of the inner tube is smaller than the inner dimension of the outer tube (5,5') and wherein the inner tool surface of the second drawing die comprises at least a section projecting inwardly, such that a groove extending in a longitudinal direction of the inner tube is drawn in the outer surface of the inner tube, wherein providing the outer tube (5,5') comprises optionally the steps of, - providing a hollow of metal, - drawing the hollow of metal through a first drawing die with an inner tool surface forming the outer surface of the outer tube and over a mandrel with an outer tool surface forming the inner surface of the outer tube into the outer tube, wherein a tool dimension of the inner tool surface of the first drawing die and a tool dimension of the outer tool surface of the mandrel are chosen such that the inner dimension of the outer tube (5,5') is larger than the outer dimension of the inner tube (1,1') and wherein the outer tool surface of the mandrel comprises at least one outwardly projecting section such that a groove extending in a longitudinal direction of the outer tube is drawn in the inner surface of the outer tube, inserting the inner tube (1,1') into the outer tube (5,5') such that the inner tube (1,1') extends in the outer tube (5,5'), and drawing the inner tube (1,1') and the outer tube (5,5') together through a third drawing die with an inner tool surface forming the outer surface of the tube (16,16'), wherein a tool dimension of the inner tool surface of the third drawing die is chosen such that by the drawing the inner dimension of the outer tube (5,5') is reduced such that after drawing the outer tube (5,5') is force-fitted onto the inner tube (1,1') characterized in that prior to the step of inserting the inner tube (1,1') into the outer tube (5,5') at least one signal line is placed in the groove of the inner tube. - providing a hollow of metal, - drawing the hollow of metal through a second drawing die having an inner tool surface forming the outer surface of the inner tube into the inner tube, wherein the tool dimension of the inner tool surface of the second drawing die is chosen such that the outer dimension of the inner tube is smaller than the inner dimension of the outer tube (5,5') and wherein the inner tool surface of the second drawing die comprises at least a section projecting inwardly, such that a groove extending in a longitudinal direction of the inner tube is drawn in the outer surface of the inner tube, wherein providing the outer tube (5,5') comprises optionally the steps of, - providing a hollow of metal, - drawing the hollow of metal through a first drawing die with an inner tool surface forming the outer surface of the outer tube and over a mandrel with an outer tool surface forming the inner surface of the outer tube into the outer tube, wherein a tool dimension of the inner tool surface of the first drawing die and a tool dimension of the outer tool surface of the mandrel are chosen such that the inner dimension of the outer tube (5,5') is larger than the outer dimension of the inner tube (1,1') and wherein the outer tool surface of the mandrel comprises at least one outwardly projecting section such that a groove extending in a longitudinal direction of the outer tube is drawn in the inner surface of the outer tube, inserting the inner tube (1,1') into the outer tube (5,5') such that the inner tube (1,1') extends in the outer tube (5,5'), and - providing a hollow of metal, - drawing the hollow of metal through a first drawing die with an inner tool surface forming the outer surface of the outer tube and over a mandrel with an outer tool surface forming the inner surface of the outer tube into the outer tube,