Abstract: The wave propagation signal transmission device according to the invention comprises two coupled distributed-constant wave propagation lines. The lines include active members of amplifying signals in transit in the form of linear and continuous components in parallel relationship. In particular, a cathode 318, and control grid 320, decoupling/accelerating screen grids 324, 326, receive, at E, HF signals to be amplified, and an anode 322 delivers, at S, amplified signals. Possible uses of the device according to the invention are high power and very wide band HF amplification and the generation of electromagnetic pulses very steep rise front and of long duration.