4-400A

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The 4-400A  /  8438 Vacuum tube is used as an amplifier, oscillator or modulator.

Electrical specifications for the 4-400A  /  8438  Vacuum tube:

Filament                                                                    Oxide Coated

Voltage                                                                               5 Volts

Current                                                                          14.7 Amps

Amplification factor                                                                   5.1

Plate Dissipation                                                             400 Watts

Grid Dissipation                                                                 10 Watts

Maximum frequency for full rating CW                            110 MHz

Capacitance  Grounded Cathode connection:

Input                                                                                   12.5 pF

Output                                                                                  4.7 pF

Feedback                                                                              .12 pF

 Mechanical specifications for the 4-400A  /  8438  Vacuum tube:

 Cooling                                                                        Forced Air

Base                                                                                       5 Pin

Length                                                                                6.38 in.

Diameter                                                                             3.56 in.

Weight                                                                                    9 oz.