The EABC80 is a triple diode triode and the M-OV Type designation of DH719 takes second place on the glass as the EABC80 is both the Philips/Mullard code and the universal generic name as well. This is a Foreign made valve and was probably made after the late 1960s.
The triode and two diodes share a common cathode but one diode has a separate cathode.
The EABC80 was specifically designed for use in the detector stage of early FM and FM/AM radios. The triode section providing the first audio amplification, the single diode and one of the diode pair were used as an FM detector in a ratio detector circuit. The other diode in the pair being used as the AM detector when that part of the circuit was required.
This design was also produced in versions for universal sets (no mains transformer). SeeUABC80 and PABC80.
The three sections are an identifying feature of these valves.
The heaters connect at the top via the ribs seen on the right. All of the sections have the same dimensions.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.
References: Datasheet, 3002 & 1040. Type EABC80 was first introduced in 1952.