3A–167M (CV5112) tube Repeater Triode valve

 

 

The 3A/167M is an indirectly heated triode of very high mutual conductance which has been developed for use in the output stages of wide band amplifiers, and for cascade low noise amplifiers.

It is an electrical equivalent of the USA type 437A

 

CATHODE

 

            Indirectly heated, oxide-coated                                       

               

                Heater Voltage                                                                     6.3                          V

 

                Heater current                                                                      0.45                        A

 

CHARACTERISTICS

 

Measured at Va = 150V Ia = 40mA

                Mutual conductance                                                           47                           mA/V

 

                Impedance                                                                           1000                       Ω

 

 

DIRECT INTERELECTRODE CAPACITIES

 

            Grid to cathode                                                                    11                           pF

 

                Anode to cathode                                                                2.5                          pF

 

                Anode to grid                                                                        4                              pF

 

DIMENSIONS

 

            Maximum overall length                                                    54.8                        mm

 

Maximum seated height                                                    41.3                        mm

 

Maximum diameter                                                            30.2                        mm

 

Base                                                                                       B8G

 

Net weight                                                                             22                           g

 

Mounting Position                                                                any

 

 

MAXIMUM RATINGS AND TYPICAL OPERATION CONDITIONS

 

Maximum ratings

 

            Maximum direct anode voltage                          350                   V

 

            Maximum direct anode current                           45                     mA

 

            Maximum direct anode dissipation                     6.5                    W

 

 

Typical Operating Conditions

 

           *            Direct anode voltage                                         150                   V

 

            Direct anode current                                          40                     mA

 

           †Direct grid supply voltage                                 +9                    V

 

           †Cathode resistor                                                           262                   Ω

 

            Equivalent noise resistance                                65                     Ω

 

            Mutual conductance                                          47                     mA/V

 

 

* Referred to cathode                           

 

 

 † It is recommended that the required grid bias to be obtained in this manner.

The actual voltage between grid and cathode is equal to the difference between the grid supply voltage and the voltage developed across the cathode resistor when cathode current is flowing.