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30 November 2021 

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

Manufactured by Standard Telephones and Cables Ltd

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General Information

Photo of A/167M (CV5112) Repeater Triode
Photo of A/167M (CV5112) Repeater Triode



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




            Indirectly heated, oxide-coated                                       


                Heater Voltage                                                                     6.3                          V


                Heater current                                                                      0.45                        A




Measured at

Va = 150V

Ia = 40mA

                Mutual conductance                                                           47                           mA/V


                Impedance                                                                           1000                       Ω





            Grid to cathode                                                                    11                           pF


                Anode to cathode                                                                2.5                          pF


                Anode to grid                                                                        4                              pF




            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


            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.

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3A/167M (CV5112) technical illustration

3A/167M (CV5112) technical illustration

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