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The S11E12 is a special quality beam tetrode intended for use as a series or shunt control valve in stabilised power supply units and has similar characteristics (within ratings) to the 12E1. It is indirectly heated and should be parallel connected to the supply. A special shock resistant construction is employed which gives increased reliability and life expectancy.
RATINGS
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 13.5 mA/V gm *
Inner µ 5.5 µg1-g2 *
Maximum Anode Dissipation 28 W Pa(max)
Maximum Screen Dissipation 5 W Pg2(max)
Maximum Cathode Current 300 mA Ik(max)
Maximum Heater to Cathode Voltage 350 V Vh-k(max)
(DC Heater negative)
Maximum Heater to Cathode Voltage 150 V Vh-k(max)
(DC Heater positive)
Maximum Resistance Grid1 to Cathode 100,000 Ω Rg1-k(max)
Fixed Bias
Maximum Resistance Grid 1 to Cathode 1 MΩ Rg1-k(max)
-Cathode Follower
Maximum Acceleration 2 g
(Continuous Operation)
Maximum Shock 500 g
(Short Duration)
Maximum Peak Anode Voltage 1,500 V Va(pk)max†
* Measured at Va=Vg2=150V; Ia=200mA; Ig2=12mA; Vg1= - 8.5V.
† For duty cycle of 1/25 and maximum pulse duration 200µ seconds
All Maximum ratings are Absolute Values not Design Centres.
INTER-ELECTRODE CAPACITANCES (Pf)
Anode/Grid1 1.8 ca-g1
Grid1/Earth 19.5 c in
Anode/Earth 16.5 c out
“Earth” denotes the remaining earthly potential electrodes, heater and shields connected to cathode
DIMENSIONS
Maximum overall length 98 mm
Maximum seated height 83 mm
Maximum diameter 44 mm
Base B8G
Net weight 71 g
Mounting Position – Vertical. If run horizontally then it is recommended that the axis AB be on a vertical plane
CONNECTIONS
Pin 1 Internal Connection IC
Pin 2 Heater h
Pin 3 Anode a
Pin 4 Grid 2 g2
Pin 5 Grid1 g1
Pin 6 Beam Plates bp
Pin 7 Heater h
Pin 8 Cathode k
Note. – Pins 6 and 8 should be connected at the valve holder
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