Power - Beam (NOT sweep) ·BeamPower
Industrial beam tetrode with 35-watt maximum anode dissipation, designed for stabilized power-supply applications and electronic control service.
An indirectly heated beam power tetrode designed for high-power applications, specifically optimized for use as a series regulator or control element in stabilized power supply units.
The 12E14 is a robust, indirectly heated beam tetrode manufactured by Associated Electrical Industries (AEI) under the Ediswan brand. Characterized by a high anode dissipation rating of 35 W and a substantial cathode current capability of 300 mA, this tube is primarily designed for service in stabilized power supply units. Its electrical design and physical construction allow it to handle significant voltage and current spans, making it well-suited for series pass or shunt regulator configurations in demanding power conditioning circuitry.
The 12E14 features a high-demand heater designed for reliable thermionic emission under continuous duty. The electrical limits are specified under the absolute maximum rating system, which defines the boundaries within which the device can be safely operated.
The heater is designed for AC or DC operation, requiring a nominal voltage of 6.3 V.
| Heater Parameter | Symbol | Value |
|---|---|---|
| Heater Voltage | Vh | 6.3 V |
| Heater Current | Ih | 1.6 A |
| Calculated Heater Power | Ph | 10.08 W |
The heater power is calculated as: Ph = Vh * Ih = 6.3 V * 1.6 A = 10.08 W
To ensure device longevity and prevent catastrophic failure, the operating conditions must not exceed the following absolute maximum values:
| Rating | Symbol | Value |
|---|---|---|
| Maximum Anode Voltage | Va(max) | 800 V |
| Maximum Screen Voltage (Grid 2) | Vg2(max) | 300 V |
| Maximum Control Grid Voltage (Grid 1) | Vg1(max) | -100 V |
| Maximum Control Grid to Screen Voltage | Vg1-g2(max) | 400 V |
| Maximum Anode Dissipation | Pa(max) | 35 W |
| Maximum Screen Dissipation | Pg2(max) | 5 W |
| Maximum Cathode Current | Ik(max) | 300 mA |
| Maximum Heater-to-Cathode Voltage (DC, heater negative) | Vh-k(max) | 300 V |
The ratio of maximum screen dissipation to maximum anode dissipation is calculated as: Pg2(max) / Pa(max) = 5 W / 35 W = 14.3%
This ratio indicates that while the anode is capable of handling substantial thermal loads, the screen grid must be carefully protected with appropriate current-limiting resistors or voltage-stabilizing networks to avoid exceeding its 5 W limit.
The 12E14 is housed in a large glass envelope designed to facilitate the dissipation of heat generated by the 35 W anode and 10.08 W heater.
The tube is designed to be mounted vertically. However, horizontal operation is permissible under strict physical alignment conditions. If the tube is run horizontally, the specific axis designated AB on the base diagram must lie on a horizontal plane. This orientation ensures that internal electrode structures, particularly the grids and the cathode, do not sag under gravity and cause internal short circuits or shifts in electrical characteristics during operation.
The 12E14 utilizes the BASE-108 arrangement. The pin connections, viewed from the free end of the pins (underside of the base), are structured as follows:
| Pin Number | Connection | Symbol |
|---|---|---|
| Pin 1 | Internal Connection | IC |
| Pin 2 | Heater | h |
| Pin 3 | Anode | a |
| Pin 4 | Grid 2 (Screen Grid) | g2 |
| Pin 5 | Grid 1 (Control Grid) | g1 |
| Pin 6 | Beam Plates | bp |
| Pin 7 | Heater | h |
| Pin 8 | Cathode | k |
The 12E14 is a high-power, indirectly heated beam tetrode designed by AEI/Ediswan for heavy-duty voltage regulation and power supply stabilization. With a robust 6.3 V, 1.6 A heater, the tube provides a high-emission cathode capable of delivering up to 300 mA of continuous current. It supports anode voltages up to 800 V and an anode dissipation of 35 W, balanced by a screen grid rating of 300 V and 5 W. The device is housed in a standard envelope with a BASE-108 octal-style configuration, requiring external connection of its beam plates to the cathode. Its mechanical design permits vertical mounting, or horizontal mounting provided the designated AB axis is aligned horizontally.
International Octal
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Maximum control-grid voltage
-100 V
Maximum control-grid-screen voltage
400 V
Maximum heater-cathode voltage
300 V
HeaterNegative
Data set 02
Published operating points and test conditions from this source.
Maximum control-grid voltage
-100 V
Maximum control-grid-screen voltage
400 V
Maximum heater-cathode voltage
300 V
HeaterNegative