EL84 / 6BQ5 Vacuum tube Pentode

The vacuum tube EL84 or 6BQ5 is the R.F. output pentode tube. The dimensions and connections of the tube are shown on Picture 1. The following data are for the EL84 tube manufactured by JJ Electronic.

Picture 1: EL84 Vacuum Tube Pentode Dimensions and Connections


Electrical Data:

Cathode heater:

> Heater Voltage: 6.3 V;
> Heater Current: 760 mA;

Typical Characteristics:

> Plate Voltage: 250 V;
> Screen Voltage: 250 V;
> Grid Voltage: -7.3 V;
> Plate Current: 48 mA;
> Screen Current: 5.5 mA;
> Transconductance: 11.3 mA/V;
> Input Resistance: 40 kOhms;
> Amplification Factors (g1/g2): 19.

Limiting Values:

> Plate Voltage: 300 V max;
> Plate Dissipation: 12 W max;
> Screen Voltage: 300 V max;
> Screen Dissipation: 2 W max;
> Cathode Current: 65 mA max;
> Negative DC Grid Voltage: -100 V max.


Capacitances:

> Cgk = 10 pF;
> Cpk = 5.1 pF;
> Cgp = 0.6 pF.


Source: JJ Electronic.