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12E1 tube (electron valve/beam tetrode)

12E1 tube (electron valve/beam tetrode) Manufactured by Standard Telephones and Cables Ltd

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General Information

Photo of 12E1 manufactured by STC Photo of 12E1 manufactured by GEC Photo of 12E1 manufactured by Mazda
Photo of 12E1 manufactured by STC shown with box

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The 12E1 is intended for use as a series or shunt control valve in stabilised power


Heater Voltage                                                  6.3       V          Vh

Heater Current                                                            1.6       A          Ih

Maximum Anode Voltage                                  800      V          Va(max)

Maximum Screen grid voltage                           300      V          Vg2(max)

Maximum Control Grid Voltage                                    -100     V          Vg1(max)

Maximum Voltage between Grids 1&2              400      V          Vg1-g2(max)

Mutual conductance                                         14        mA/V   gm        *

Inner µ                                                             5.3                   µg1-g2  *                               

Maximum Anode Dissipation                            35        W        Pa(max)

Maximum Screen Dissipation                            5          W        Pg2(max)

Maximum Cathode Current                             300      mA       Ik(max)

Maximum potential Heater/Cathode                 00        V          Vh-k(max) †
(Volts DC                                 

* Taken at Va=Vg2=150V; Ia=200mA;  

† Provided the cathode is positive

All Maximum ratings are Absolute Values not Design Centres. 


Grid/Earth                                            23.0     c in

Anode/Earth                                         8.0       c out

Anode/Grid                                          0.85     ca, g1 <

 “Earth” denotes the remaining earthly potential, electrodes and heater joined to cathode


Maximum overall length                                                146      mm

Maximum seated height                                                133      mm 

Maximum diameter                                          54        mm

Net weight                                                       71        g


– Vertical.

If run horizontally then the axis AB must be on a horizontal  plane     

12E1 mounting position diagram

BASE - International Octal

TOP CAP - American Miniature – CT1


Pin 1                No Connection                        NC

Pin 2                Heater                                      h

Pin 3                No Connection                                    NC                 

Pin 4                Screen Grid                              g2

Pin 5                Control Grid                            g1

Pin 6                No Connection                        NC

Pin 7                Heater                                      h                                                         

Pin 8                Cathode                                   k

Top Cap           Anode                          a

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Click here for information about replacing a KT88 Beam Tetrode with a 12E1 Beam Terode

12E1 Beam Tetrode indirectly heated for parallel operation
12E1 Beam Tetrode anode and screen current in mA
12E1 Beam Tetrode grid volts
12E1 Beam Tetrode anode volts

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