ECC802S

ECC802S has no equivalent designation confirmed by the archive.

The ECC802S is a double triode of special quality with separate cathodes, housed in an all-glass miniature envelope with a nine-pin base. Both triode systems are brought out separately, and the centre tap of the heater is brought out to a separate pin. It has indirect heating with an oxide cathode, operable from direct or alternating current.

Construction and Ratings

The ECC802S has a transconductance of 2.2 mA/V and an amplification factor of 17. The heater can be connected in parallel for a voltage of 6.3 V ± 5 % at 0.3 A, or in series for a voltage of 12.6 V ± 5 % at 0.15 A. Maximum ratings include an operating anode voltage of 300 V, a cold anode voltage of 550 V, an anode dissipation of 2.75 W, a cathode current of 15 mA, a peak cathode current of 200 mA, and a negative control-grid voltage of 100 V. The maximum voltage between cathode and heater is ±100 V, with a maximum external resistance between them of 20 kΩ, or 150 kΩ when used as a phase inverter. Maximum bulb temperature is 170 °C.

Characteristics

At the characteristic conditions of an anode voltage of 250 V and a cathode resistor of 800 ± 1 % ohms, the anode current is 10.6 ± 1.9 mA and the transconductance is 2.2 -0.4/+0.5 mA/V. The internal resistance at these conditions is 7.7 to 10.8 kΩ. Cut-off anode current with a grid voltage of -25 V is less than 0.4 mA. Input capacitance is 1.8 ± 0.3 pF, output capacitance is 0.37 ± 0.1 pF, and grid-to-anode capacitance is 1.19 ± 0.3 pF.

Applications

The ECC802S is suitable for universal use in low-frequency amplifiers as a voltage amplifier, phase inverter, multivibrator, blocking oscillator, and similar roles. It is tested for microphony, hum, and operation under reduced pressure, and is designed to meet requirements for special-quality valves, including resistance to prolonged vibration, individual shocks, multiple shocks, constant acceleration, reduced atmospheric pressure, climatic influences, narrow tolerances, operational reliability, and guaranteed long life.

Original manufacturer datasheets for ECC802S, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• ECC802S