12E1 tube (electron valve/beam tetrode)12E1 tube (electron valve/beam tetrode) Manufactured by Standard Telephones and Cables LtdGeneral InformationThe 12E1 is intended for use as a series or shunt control valve in stabilised power RATINGSHeater 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) † * Taken at Va=Vg2=150V; Ia=200mA; † Provided the cathode is positive All Maximum ratings are Absolute Values not Design Centres. INTER-ELECTRODE CAPACITANCES (Pf)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 DIMENSIONSMaximum overall length 146 mm Maximum seated height 133 mm Maximum diameter 54 mm Net weight 71 g MOUNTING POSITION– Vertical.If run horizontally then the axis AB must be on a horizontal plane BASE - International OctalTOP CAP - American Miniature – CT1CONNECTIONSPin 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 Click here for information about replacing a KT88 Beam Tetrode with a 12E1 Beam Terode
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