Note how the two diodes are screened from the triode by a shield connected to the cathode.Ĭonnection to the grid of the triode is made via the terminal at the top of the valve, while the disposition of the pins in the base and their connection to the other electrodes is shown in Fig. The relative positions of the electrodes are well illustrated in this diagram and photo. The function of the screen is to ensure that the capacity between these auxiliary anodes and the anode of the triode shall be as low as possible, so that the minimum amount of radio-frequency energy or high audio-frequency energy is passed on directly from the rectifier to the amplifier section of the valve. Shielding the anode of this triode from the lower portion of the construction is a metal screen connected to the cathode, and beneath this are supported the two auxiliary anodes of the diodes. 1 will show that in construction the upper portion is very similar to the normal indirectly-heated triode of the MH4 class. Reference to the photograph of the new Marconi MHD4 in Fig. As its title implies, it consists of two diode rectifiers and a triode amplifier contained in the same bulb. The double-diode triode is a valve developed specially for use in Automatic Volume Control circuits. The MHD4 has been developed especially for automatic volume control, and consists of one triode and two diode valves in one bulb. A valuable development in valve technique which has already created considerable interest and is assured of wide use in the near future, - particularly in circuits of the AVC type.
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