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3CX300H

General

Modulator triode.
Application: in series anode modulation circuits and electronic voltage regulators.
Envelope: metal-ceramic.
Cooling: forced air.
Mass 200 g.

Lead diagram

General characteristics

Filament voltage, Volt 6.3
Anode voltage, Volt 600
Grid voltage, Volt 30

Filament (heater) current, A 2.650.2
Anode current, mA no less than 500
Reverse grid current, mA no more than 30
Grid voltage -3010 Volt
Grid cut-off voltage, Volt no more than -400
Mutual conductance 206 mA/Volt
Gain coefficient more than 6
Warm-up time 1.5 min
Inter electrode capacitance, pF  
input £ 25
output £ 1
transfer £ 10
Operation time, h more than 1000

Limited operating values

Cathode current, steady component 250 mA
Peak cathode current 500 mA
Filament voltage, V 6 to 6.6
Peak anode voltage, V 2200
Grid voltage, V -400
Anode dissipation, W 300
Grid dissipation, W 1

Plate-grid and plate curves