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4CX400H

General

Tetrode.
Envelope: metal-ceramic.
Cooling: forced air.
Mass 220 g.

Lead diagram

General characteristics

Filament voltage, Volt 6.3
Anode voltage, Volt 1000
2nd grid voltage, Volt 325
Plate current 400 mA

Filament (heater) current, A 3.150.2
Pulse anode current, A no less than 0.7
1st grid voltage -14.57.5 Volt
1st grid cut-off voltage £ 60 Volt
Mutual conductance 20 to 34 mA/V
Output power no less than 250 W
Inter electrode capacitance, pF:  
input 24
output 7
transfer £ 0.08
Operation time, h more than 1000

Limited operating values

Filament voltage, V 6 to 6.6
Anode voltage, steady component, V 2100
Peak anode voltage, V 4000
1st grid current 5 mA
1st grid voltage, V -60
2nd grid voltage, V 325
Cathode voltage, steady component, V 400 mA
Cathode pulse current, A 34
Anode dissipation, W 400
1st grid dissipation, W 0.2
2nd grid dissipation, W 8
Operating frequency 500 MHz

Plate-grid and plate curves