The output beam tetrode 6P21S with a directly heated cathode is designed to generate and amplify high-frequency voltage.

It is used in the final stages of low power transmitters. Can be used to amplify low frequency power.

Pin assignment 6P21S:

1,4,6 Middle point of the filament cathode, beamforming plates

2 Heater (glow)

3 Second grid

5 First grid

7 Heater (glow)

A Anode (upper terminal)

Lamp 6P21S is made in a glass case. The base is octal with 8 pins, the anode is brought to the top cap. Works in any position. Oxide tape cathode of direct heating.

Lamp parameters 6P21S:

(nominal mode)

Heating voltage 6.3V

Filament current 750±60mA

Anode voltage 600V

Voltage of the second grid 200V

Voltage on the first grid -16V

Anode current 36±14mA

Anode current at the beginning of the characteristic1 1mA

Reverse current of the first grid2 <3uA

Current in the circuit of the second grid <3mA

Slope3 4mA/V

Output oscillation power4 >28W

Output power at UN=5.7V>20W

Vibration voltage <1000mV

Input capacitance 8.2pF

Output capacitance 6.5pF

Through capacitance <0.15pF

Cathode heating time 5 sec

Dimensions Ø37x90mm

Minimum running time 500h

Limit parameters 6P21S:

Heating voltage 6.0..6.6V

Anode voltage 600V

Voltage of the second grid 250V

Maximum anode power 18W

Maximum power on the second grid 3.5W

Voltage cathode-heater +90V -200V

Cathode current 100mA

Medium temperature -60..+70°C