Power - Triode (over 1000V 100W) ·Triode
Directly heated graphite-anode radiation-cooled triode for relay and vibrator amplifiers plus low-RF and audio-frequency service, mechanically and electrically identical to V1505.
A directly heated, radiation-cooled power triode designed for high-power low-frequency and radio-frequency applications, including relay and vibrator amplifiers.
The 14D13 is a heavy-duty, directly heated radiation-cooled triode manufactured by Associated Electrical Industries Limited (AEI) under the Ediswan brand. It is mechanically and electrically identical to the V1505 triode. Featuring a robust graphite anode and a thoriated tungsten filament, the 14D13 is designed primarily for demanding industrial and communications applications. Its specified services include relay and vibrator amplifiers, as well as other low-frequency audio-frequency (A.F.) and radio-frequency (R.F.) applications.
The physical design of the 14D13 is optimized for high-power dissipation through radiation cooling. The tube incorporates a graphite anode, which provides excellent thermal stability and heat dissipation under continuous load conditions. The filament is a thoriated tungsten type, offering high electron emission efficiency.
Due to its high operating temperatures and physical size, the 14D13 must be mounted in a vertical, base down position to ensure proper heat convection and mechanical stability. The tube uses a Special 4-pin base configuration.
The physical dimensions of the envelope are substantial:
The 14D13 operates with a high-current filament supply and is rated under the absolute value system. The filament is designed to run from either AC or DC sources.
| Parameter | Symbol | Value |
|---|---|---|
| Filament Voltage | Vf | 14 ± 5% V |
| Filament Current | If | 7.0 A |
| Maximum Anode Voltage (D.C.) | Va(max) | 3.0 kV |
| Maximum Peak Cathode Current | ik(pk)max | 4.0 A |
| Maximum Anode Dissipation (continuous) | Pa(max) | 300 W |
| Maximum Operating Frequency (at full ratings) | f(max) | 1.5 Mc/s |
The internal capacitances of the triode structure determine its performance at higher frequencies and influence the design of neutralizing circuits in R.F. applications:
Under typical static operating conditions, the 14D13 exhibits a moderate amplification factor combined with a relatively low plate resistance, enabling efficient power transfer. At a specified operating point, the static characteristics are as follows:
The 14D13 is highly suited for high-power Class AB2 push-pull audio amplification. Typical operating parameters for a two-valve push-pull configuration are documented below. Unless otherwise specified, the voltage and current values represent the requirements or performance of a single valve in the pair:
| Parameter | Symbol | Value |
|---|---|---|
| Anode Voltage (d.c., no signal) | Va | 2.68* kV |
| Anode Voltage (d.c., maximum signal) | Va | 2.5 kV |
| Grid Voltage (d.c., approximate) | Vg | -160 V |
| Grid Voltage (r.m.s., A.F. Sine Wave) | Vg(r.m.s.) | 180 V |
| Anode Current (d.c., no signal) | Ia | 100 mA |
| Anode Current (d.c., maximum signal) | Ia | 350 mA |
| Grid Current (d.c., maximum signal, approx.) | Ig | 25 mA |
| Grid Current (peak, approx.) | ig(pk) | 400 mA |
| Driving Power (maximum signal, approx.) | Pd | 6.0 W |
| Maximum Anode Dissipation | Pa(max) | 300 W |
| Anode-to-Anode Load (two valves) | RL(a-a) | 10 kΩ |
| Power Output (maximum signal, two valves) | Pout | >1.2 kW |
| Total Distortion (at maximum signal, two valves) | D | <5 % |
*Note: The no-signal anode voltage of 2.68 kV is based on a high-tension (h.t.) supply regulation of 10%.
In this Class AB2 configuration, the two-valve stage is capable of delivering an output power in excess of 1.2 kW with less than 5% total harmonic distortion. This high power output requires a driving power of approximately 6.0 W at maximum signal, reflecting the grid current flow during positive grid excursions (with peak grid current reaching approximately 400 mA).
The 14D13 is a high-power, directly heated, radiation-cooled triode featuring a graphite anode and a thoriated tungsten filament. It is mechanically and electrically identical to the V1505. Operating with a nominal 14 V, 7.0 A filament supply, the tube is rated for a maximum continuous anode dissipation of 300 W and a maximum D.C. anode voltage of 3.0 kV. It is designed for vertical, base-down mounting using a special 4-pin base.
With an amplification factor of 16 and a mutual conductance of 8.0 mA/V, the 14D13 is optimized for heavy-duty applications such as relay and vibrator amplifiers, as well as low-frequency and R.F. services up to 1.5 Mc/s. In Class AB2 push-pull service, a pair of 14D13 valves can deliver more than 1.2 kW of audio power with less than 5% distortion, making it an exceptionally powerful and robust choice for high-power modulator and amplifier designs.
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 operating frequency
15 MHz
Power output
1.2 kW
ClassAB;PushPull;TwoTubes
Anode-grid capacitance
18 pF
Grid-filament capacitance
14 pF
Anode-filament capacitance
9 pF
Data set 02
Published operating points and test conditions from this source.
Maximum operating frequency
15 MHz
Power output
1.2 kW
ClassAB;PushPull;TwoTubes
Anode-grid capacitance
18 pF
Grid-filament capacitance
14 pF
Anode-filament capacitance
9 pF