Sensibly equivalent¶ to:
The ELL80 came into service at the end of the 1950's, and is a double output pentode. It was designed as a push pull audio output stage in a single envelope. The two valves have a metal screen between them and a common cathode and suppressor grid. The total dissipation is given as 2 x 6 W. and the output is given as 3 W. the cathode resistor is given as 160 Ohms.
The basic electrical design also appeared for series heater use as the PLL80 and ULL80 with 300 mA and 100 mA heaters respectively.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.
References: Datasheet & 1040. Type ELL80 was first introduced in 1959.
Absolute Maximum Operating Conditions¶
Updated February 09, 2015.