6CK6

6CK6 is also designated EL83.

The 6CK6 is a sharp-cutoff pentode with a coated unipotential cathode, housed in a T61 bulb with a small button noval 9-pin base.

Construction

The tube has a maximum overall length of 3 1/16 inches and a maximum seated height of 2 13/16 inches. Its bulb length excluding tip is 2 7/16 inches ± 3/32 inch, and its maximum diameter is 7/8 inch. The 6CK6 may be mounted in any position.

Pin assignments are as follows: pin 2 is grid No. 1, pin 3 is the cathode, pins 4 and 5 are the heater, pin 6 is grid No. 3, pin 7 is the plate, pin 8 is the internal shield, and pin 9 is not connected.

Ratings

The heater requires 6.3 volts at 0.71 ampere. Maximum ratings include a plate voltage of 300 volts (550 volts without current), a plate dissipation of 9 watts, a grid-No.-2 voltage of 300 volts (550 volts without current), a grid-No.-2 dissipation of 2 watts, a cathode current of 70 milliamperes, and a voltage between heater and cathode of 100 volts. The maximum grid-No.-1 circuit resistance with automatic bias is 1 megohm.

Typical Characteristics

Typical characteristics, measured at a plate voltage of 250 volts, a grid-No.-2 voltage of 250 volts, and a grid-No.-3 voltage of 0 volts, include a grid-No.-1 voltage of -5.5 volts, a plate current of 36 milliamperes, a grid-No.-2 current of 5 milliamperes, a transconductance of 10,000 micromhos, a plate resistance of 0.13 megohm, and an amplification factor of grid No. 2 with respect to grid No. 1 of 24.

Capacitances

Interelectrode capacitances are: plate-to-all-other-elements-except-grid-No.-1, 6.6 μμF; grid-No.-1-to-all-other-elements-except-plate, 11.2 μμF; grid-No.-2-to-grid-No.-1, 3.2 μμF; plate-to-grid-No.-1, 0.1 μμF maximum; and grid-No.-1-to-heater, 0.15 μμF maximum.

French Datasheet Designation

A French datasheet identifies the 6CK6 as the EL 83 and describes it as a video-frequency amplifier tube. The sheet gives the EL 83 maximum grid-No.-1 circuit resistance with fixed bias as 0.5 megohm and the maximum external resistance between heater and cathode as 20 kilohms. It specifies a maximum grid-No.-1 voltage of 1.3 volts at a grid-No.-1 current of +0.3 µA. The EL 83 sheet lists the bulb as A22-4 and base as 9C12 (noval), with pin 1 as grid No. 2 and the remaining pin functions agreeing with those given above. Capacitance values in the French sheet are given as 10.8 pF input, 6.6 pF output, 0.1 pF maximum grid-No.-1-to-anode, 0.15 pF maximum grid-No.-1-to-filament, and 3.2 pF grid-No.-1-to-grid-No.-2.

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 6CK6, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

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• EL 83 (filed under EL83)