7815RAL

High-reliability forced-air-cooled ceramic-metal planar triode for pulsed airborne service at frequencies extending to approximately 3 GHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5.7 V / 950 mA

Description

Airline/high-reliability ceramic/metal planar triode for pulsed airborne service to 3 GHz.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 5.7 V
Nominal heater current: 950 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.025 S
Amplification factor: 100
Max plate voltage: 3500 V
Max plate dissipation: 10 W
Max grid dissipation: 2 W
Max cathode current: 4.8 A

Promoted maximum ratings/characteristics populated from published headings; service-specific values retained in parameters.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Current, at [1]
5.7 V
Current, at 5.7 vOltS . . . v v v it s i s it e s e e e 0.95 A
Current, at [2]
0.95 V
Current, at 5.7 vOltS . . . v v v it s i s it e s e e e 0.95 A
Amplification Factor (Average) « v v v v v v v vt v it vttt it ii s oo ee e
100
Amplification Factor (Average) « v v v v v v v vt v it vttt it ii s oo ee e 100
Direct Interelectrode Capacitance (grounded cathode)
2
Direct Interelectrode Capacitance (grounded cathode)2,without heater voltage:
Published value
2
2. Capacitance values are for a cold tube as measured in a special shielded fixture.
RF POWER AMPLIFIER OR OSCILLATOR OPERATING CONDITIONS FOR THE [1]
7815
RF POWER AMPLIFIER OR OSCILLATOR OPERATING CONDITIONS FOR THE 7815AL and 7815RAL in
RF POWER AMPLIFIER OR OSCILLATOR OPERATING CONDITIONS FOR THE [2]
7815
RF POWER AMPLIFIER OR OSCILLATOR OPERATING CONDITIONS FOR THE 7815AL and 7815RAL in
Frequency
1.09 GHz
Frequency ... ... .. ... . .. ... 1.090 GHz
DC PLATE VOLTAGE [1]
3500 V
DC PLATE VOLTAGE . . ... ... 3500 vOLTS Heater Voltage . ...........¢.cou ... 5.7 V
DC PLATE VOLTAGE [2]
5.7 V
DC PLATE VOLTAGE . . ... ... 3500 vOLTS Heater Voltage . ...........¢.cou ... 5.7 V
DCPlateVoltage . . . .. ... .cv i e v,
2000
DCPlateVoltage . . . .. ... .cv i e v, 2000 Vdc
PLATEPULSED [1]
4500 V
PLATEPULSED . . . ...... .. 4500 VOLTS DC Grid Voltage 75 Vde
PLATEPULSED [2]
75 V
PLATEPULSED . . . ...... .. 4500 VOLTS DC Grid Voltage 75 Vde
DC GRID VOLTAGE
-150 V
DC GRID VOLTAGE . . . . .. ... -150 VOLTS Poak Plate CumantT o
to cathode
-700 V
to cathode -700 VOLTS Pulse Duration. . ..o vvee
Grid positive to cathode [1]
250 V
Grid positive to cathode 250 VOLTS Useful Power Output (Approx. ) 760
Grid positive to cathode [2]
760 V
Grid positive to cathode 250 VOLTS Useful Power Output (Approx. ) 760
PULSE PLATE CURRENT
3 A
PULSE PLATE CURRENT ... ... 3.0 AMPERE PUTIAPRION) e e e eeeeee W
PULSE GRID CURRENT
1.8 A
PULSE GRID CURRENT . ... ... 1.8 AMPERE Plate-Pulsed Amplifier
DC CATHODE CURRENT [1]
125 mA
DC CATHODE CURRENT . . .. .. 125 MILLIAMPERES Frequency . ... ... .. .., 1.1 GHz
DC CATHODE CURRENT [2]
1.1 mA
DC CATHODE CURRENT . . .. .. 125 MILLIAMPERES Frequency . ... ... .. .., 1.1 GHz
AVERAGE PLATE DISSIPATION Heater Voltage
57
AVERAGE PLATE DISSIPATION Heater Voltage .. .............. ... 57 V
Conduction and Convection Peak Plate Pulse Voltage
2000
Conduction and Convection Peak Plate Pulse Voltage . . . . ... ....... 2000 Vdc
( [1]
781 W
(781BAL) . . . . v o o v e 10 WATTS DCGridVoltage . ... ... v, -45 Vdc
( [2]
10 W
(781BAL) . . . . v o o v e 10 WATTS DCGridVoltage . ... ... v, -45 Vdc
( [3]
-45 W
(781BAL) . . . . v o o v e 10 WATTS DCGridVoltage . ... ... v, -45 Vdc
Forced Air Cooling({ [1]
7815 W
Forced Air Cooling({7815RAL). . 45 WATTS Peak Plate Current . . .. ... ... ........ 1.8 a
Forced Air Cooling({ [2]
45 W
Forced Air Cooling({7815RAL). . 45 WATTS Peak Plate Current . . .. ... ... ........ 1.8 a
Forced Air Cooling({ [3]
1.8 W
Forced Air Cooling({7815RAL). . 45 WATTS Peak Plate Current . . .. ... ... ........ 1.8 a
GRID DISSIPATION (Average) [1]
2 W
GRID DISSIPATION (Average) . . . 2 WATTS Peak Grid Current .. ... ... .. ... 1.0 a
GRID DISSIPATION (Average) [2]
1 W
GRID DISSIPATION (Average) . . . 2 WATTS Peak Grid Current .. ... ... .. ... 1.0 a
DUTY FACTORT [1]
33
DUTY FACTORT . ........... 0033 Pulse Duration. . .. ..... ... ... . ... 3.5 pus
DUTY FACTORT [2]
3.5
DUTY FACTORT . ........... 0033 Pulse Duration. . .. ..... ... ... . ... 3.5 pus
PULSE DURATIONT [1]
6
PULSE DURATIONT . .. ... ... 6 us DUty . it e e e e e e e e e e 0.001
PULSE DURATIONT [2]
0.001
PULSE DURATIONT . .. ... ... 6 us DUty . it e e e e e e e e e e 0.001
FREQUENCY [1]
3 GHz
FREQUENCY ... ... ... ..... 3 GHz DrivingPower ., ... .. ... ... 300 w
FREQUENCY [2]
300 GHz
FREQUENCY ... ... ... ..... 3 GHz DrivingPower ., ... .. ... ... 300 w
Useful Power Output (Approx.) « «
1800
Useful Power Output (Approx.) « « . .... ... 1800 w
Published value [1]
1
1, For longer pulse duration or higher duty cycle, GaIN v e e e e 8 db
Published value [2]
8
1, For longer pulse duration or higher duty cycle, GaIN v e e e e 8 db
Heater Current at [1]
5.7
Heater Current at 5.7 vOIfS + v v v v i e v it et et e e ettt e n et anneas 0.87 1.02 A
Heater Current at [2]
0.87
Heater Current at 5.7 vOIfS + v v v v i e v it et et e e ettt e n et anneas 0.87 1.02 A
Heater Current at [3]
1.02
Heater Current at 5.7 vOIfS + v v v v i e v it et et e e ettt e n et anneas 0.87 1.02 A
Grid-Plate Capacitance2. . . . v oot v vttt i ittt [1]
1.85 pF
Grid-Plate Capacitance2. . . . v oot v vttt i ittt 1.85 2.10 pF
Grid-Plate Capacitance2. . . . v oot v vttt i ittt [2]
2.1 pF
Grid-Plate Capacitance2. . . . v oot v vttt i ittt 1.85 2.10 pF
Grid-Cathode Capacitance2. . . v v v v v vt vttt it i et ts s et an [1]
5.6 pF
Grid-Cathode Capacitance2. . . v v v v v vt vttt it i et ts s et an 5.60 7.00 pF
Grid-Cathode Capacitance2. . . v v v v v vt vttt it i et ts s et an [2]
7 pF
Grid-Cathode Capacitance2. . . v v v v v vt vttt it i et ts s et an 5.60 7.00 pF
Plate-Cathode Capacitance ....... e et ettt
0.035 pF
Plate-Cathode Capacitance ....... e et ettt --- 0.035 pF
Published value [1]
1 mA
1. Measured with 1 mA plate current and a plate voltage of 1000 vdc.
Published value [2]
1 mA
1. Measured with 1 mA plate current and a plate voltage of 1000 vdc.
Published value [3]
1000 mA
1. Measured with 1 mA plate current and a plate voltage of 1000 vdc.
Published value
2
2. Capacitance values as measured with a cold tube and in a8 shielded socket. When the cathode is heated to the pro-
per temperature the grid-cathode capacitance will increase by approximately
1 pF
per temperature the grid-cathode capacitance will increase by approximately 1 pF due to thermal expansion of the
drawing. Electrical contact to the cathode, grid, The maximum plate dissipation of the
7815
drawing. Electrical contact to the cathode, grid, The maximum plate dissipation of the 7815AL
anode and also the heater should be restricted to is
10 W
anode and also the heater should be restricted to is 10 watts average power. This can be accomp-
tubes. Dimensional changes due to normal varia- sipation of the [1]
7815
tubes. Dimensional changes due to normal varia- sipation of the 7815RAL in pulse service is 45
tubes. Dimensional changes due to normal varia- sipation of the [2]
45
tubes. Dimensional changes due to normal varia- sipation of the 7815RAL in pulse service is 45
possible tube life. Depending on pulse width, tion capability of these tubes is
2 W
possible tube life. Depending on pulse width, tion capability of these tubes is 2.0 watts. For
oscillation and the amount of driving power di- safe operating temperatures in
50
oscillation and the amount of driving power di- safe operating temperatures in 50 ms or less.
heating, which depends on operating frequency
7815
heating, which depends on operating frequency 7815RAL contain an arc-resistant cathode. Per-
to cathode capacitance will be
15
to cathode capacitance will be 15%, or more, forward current. For pulse service the peak cur-
PLATE VOLTAGE (V) CURVE #MA
2373 mA
PLATE VOLTAGE (V) CURVE #MA-2373

Data set 02

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Current Range
870 mA to 1.02 A
Cathode Heating Time
60 s
Airline High Reliability Processing
1 boolean

Capacitance

Input Capacitance
6.3 pF
Output Capacitance
0.035 pF
Grid-Plate Capacitance
1.98 pF

Other

Frequency Maximum
3 GHz
Pulse Plate Voltage Maximum
3500 V
PlatePulsed
Pulse Current Maximum
4.8 A
PulseModulator
Pulse Duration Maximum
6 us
Duty Factor Maximum
0.0033
Pulse Cathode Current Maximum
4.8 A

Data set 03

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Current Range
870 mA to 1.02 A
Cathode Heating Time
60 s
Airline High Reliability Processing
1 boolean

Capacitance

Input Capacitance
6.3 pF
Output Capacitance
0.035 pF
Grid-Plate Capacitance
1.98 pF

Other

Frequency Maximum
3 GHz
Pulse Plate Voltage Maximum
3500 V
PlatePulsed
Pulse Current Maximum
4.8 A
PulseModulator
Pulse Duration Maximum
6 us
Duty Factor Maximum
0.0033
Pulse Cathode Current Maximum
4.8 A