Electron tube.

摘要

Present in- an electron tube having a glass envelope portion (1) is an electrode system (3) which is slid in the envelope portion (1) and is centred with respect to the wall (7) of the envelope portion (1) by means of a number of pretensioned springs (6). The springs (6) extend from a supporting point B which is fixed with respect to the electrode system (3) over their effective spring length towards the wall (7) of the envelope portion (1) and press against the wall (7) while forming a contact point A. A stick-slip movement of the springs over the surface of the wall (7) during the sliding movement of the electrode system (3) is avoided in that the springs (6) each extend over their effective spring length according to a straight line between supporting point B and contact point A. The occurrence of glass damage to the wall (7) is minimized by the said measure.