The ECL80 as primarily designed for use in television receivers (VHF 405 line models) with the triode as a frame blocking oscillator and the pentode as a frame output valve. Other applications include the use of the triode as a line blocking oscillator, AF voltage amplifier or in multi-vibrator circuits and the operation of the pentode as an audio output valve or a synchronising pulse separator. This valve was also used in low cost record players with high output crystal pick-ups, normally with a metal rectifier. The latter being an early solid state device.
The heater at 6.3 Volts and 300 mA makes this valve suitable for equipment with mains transformers and heater chains across the domestic mains.
The ECL80 was not without faults in use and the above article gives details.
The triode is mounted above the pentode with a n intermediate mica disc. The triode connections are made via the rods on the right of this image.
The stitched anode of the triode extends well beyond the centre active area. The words Made in Germany are unusual as we often see Made in West Germany during the time the country was divided.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.
References: Data-sheet & 1040. Type ECL80 was first introduced in 1950. See also1950 adverts.
