6CJ6

6CJ6 is also designated EL81.

General

The 6CJ6 is a beam power tetrode with a coated unipotential cathode, intended for use as a horizontal deflection amplifier in television receivers and as a class B push-pull audio output amplifier. It has a small button noval 9-pin base and a T6 ½ bulb, with a top cap connected to the plate. The maximum overall length is 3 3/16 inches, the maximum seated height is 2 15/16 inches, the bulb length excluding the top cap is 2 7/16 inches ± 3/32 inch, and the maximum diameter is 7/8 inch. The tube can be mounted in any position. The JETEC basing designation is 9AS.

Electrode Arrangement

Pin 1 is internally connected. Pin 2 is grid No.1 of the base. Pin 3 is the cathode. Pins 4 and 5 are the heater. Pin 6 is internally connected to G3. Pin 7 is internally connected to G2. Pin 8 is grid No.2. Pin 9 is grid No.3.

Ratings

The heater requires 6.3 volts at 1.05 amps. The maximum plate voltage (without current) is 550 volts; the maximum average plate voltage is 300 volts. The maximum peak positive and negative surge plate voltages are each 7000 volts. Maximum plate dissipation is 8 watts, and maximum grid No.2 dissipation is 4.5 watts, with the sum of plate and grid No.2 dissipation limited to 10 watts. The maximum grid No.2 voltage (without current) is 550 volts, and the maximum grid No.2 voltage is 300 volts. Maximum cathode current is 180 mA, and the maximum grid No.1 circuit resistance is 0.5 megohm. The maximum voltage between heater and cathode is 100 volts. The grid No.1 voltage at a grid No.1 current of +0.3 µamp is 1.3 volts maximum. The maximum permissible pulse duration is 18% of one cycle, with a maximum of 18 µsec.

Capacitances

Direct interelectrode capacitances are as follows: grid No.1 to all other electrodes, 14.7 μμF; plate to all other electrodes, 6.0 μμF; plate to grid No.1, 0.8 μμF maximum; plate to cathode, 0.1 μμF maximum; grid No.1 to heater, 0.2 μμF maximum.

Typical Characteristics

Typical characteristics are given at a plate voltage of 250 volts, with grid No.3 voltage 0 volt, grid No.2 voltage 250 volts, and grid No.1 voltage −38.5 volts. Under these conditions, plate current is 32 mA, grid No.2 current is 2.4 mA, transconductance is 4600 micromhos, plate resistance is 15,000 ohms, and the amplification factor of grid No.2 with respect to grid No.1 is 5.1.

Applications

For horizontal deflection service, the circuit should be designed around a peak anode current not exceeding 250 mA at a plate voltage of 70 volts and a grid No.2 voltage of 170 volts, or not exceeding 310 mA at a plate voltage of 70 volts and a grid No.2 voltage of 200 volts. The peak anode current of an average new tube at a plate voltage of 70 volts and a grid No.1 voltage of −1 volt is 380 mA at a grid No.2 voltage of 170 volts, and 470 mA at a grid No.2 voltage of 200 volts. The Philips datasheet gives an operating-point table for class B push-pull audio amplifier service. The Tesla datasheet, which describes the equivalent EL81, permits a mean screen grid dissipation of 6 W during the heating time of the PY83 switching diode when the tube is used as a line deflection output stage.

Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.

Original manufacturer datasheets for 6CJ6, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• Mezní hodnoty: (filed under EL81)
• 6CJ6 PHILIPS