Power - Triode ·Triode
Directly heated power triode documented in AEI industrial-valve literature; available source evidence supports industrial high-power service but not a narrower application statement without speculation.
The 16P13 is a directly heated, water-cooled power triode designed primarily for industrial and high-power radio frequency applications. Manufactured by Associated Electrical Industries Limited (AEI) under the Ediswan brand, this valve is specifically engineered for use as an R.F. oscillator in eddy current heating apparatus and similar industrial induction heating equipment.
The 16P13 features an external anode design with an integrated water-cooling jacket. It is the water-cooled version of the ESA1500 (also referred to in some documentation as the ES.MSOO) and is electrically identical to the 16P12. The primary physical distinction of the 16P13 is the inclusion of integral union connectors attached directly to the ends of the water-cooling tube. These union connectors are designed to accommodate 1/2-inch outside diameter tubing conforming to the BS2051 standard.
The tube's filament is constructed from thoriated tungsten, which is robust enough to support direct switching without requiring complex pre-heating or starting circuitry. To ensure proper operation and cooling, the 16P13 must be mounted vertically with the base positioned uppermost.
The physical structure of the 16P13 is characterized by its specialized base and external anode assembly. The key mechanical dimensions and physical parameters include:
The directly heated thoriated tungsten filament operates under the following electrical specifications:
| Parameter | Symbol | Value | Tolerance / Unit |
|---|---|---|---|
| Filament Voltage | Vf | 8.0 | 5% V |
| Filament Current | If | 26 | A |
The calculated nominal power required to heat the filament is 208 W (derived from the nominal 8.0 V voltage and 26 A current).
Under typical operating conditions, the 16P13 exhibits the following electrical characteristics:
The absolute maximum ratings of the 16P13 define its safe operating envelope for continuous and pulsed operation:
The maximum operating frequency of the valve is subject to two distinct limiting factors:
The internal capacitances between the electrodes of the 16P13 are specified as follows:
The 16P13 is a high-power, directly heated, water-cooled triode featuring a thoriated tungsten filament, an external anode, and a specialized base. Operating with an 8.0 V, 26 A filament supply, it is capable of handling up to 8 kV D.C. on the anode and dissipating up to 3.0 kW. Its integrated water-cooling system, complete with union connectors for 1/2-inch BS2051 tubing, allows it to function reliably as an R.F. oscillator in demanding industrial environments such as eddy current heating. The device must be operated in a vertical, base-up orientation and is rated for operation up to 10 Mc/s under water-connection limits, or up to 40 Mc/s when limited solely by the valve's internal structure.
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
REDO promoted-field audit
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 operating frequency
50 MHz
Full-rating frequency
25 MHz
Anode-filament capacitance
0.8 pF
Grid-filament capacitance
14.5 pF
Typical anode voltage
5000 V
Typical anode current
400 mA
Data set 02
Published operating points and test conditions from this source.
Maximum operating frequency
50 MHz
Full-rating frequency
25 MHz
Anode-filament capacitance
0.8 pF
Grid-filament capacitance
14.5 pF