The RS1003 is a VHF transmitting pentode for use up to 100 MHz at full rating. It is indirectly heated with an oxide coated cathode and an anode dissipation of 60 Watts.
Full details are in the data-sheet, which is written in German and we have no English translation as yet.
The construction is similar to the European double Beam tetrodes such as the QQV07-50 with a central core and anodes each side of the central column. Here the anodes are connected together internally.
One anode showing the additional fins for greater head dissipation.
The valve in side view. Anodes each side and a central column with two wire grids. Also visible is a bright beam plate showing that this pentode is made as a beam tetrode. The control grid has a smaller pitch than the screen grid.
The wide glass tube envelope is 50 mm in diameter, and excluding the base pins is 89 mm tall.
Reference: Datasheet. Type RS1003 was first introduced in 1961.