Data set 01
1962 Eimac
Published operating points and test conditions from this source.
Triode
Other
Heater: Voltage . . ....... ..., e e e [1]
57
Heater: Voltage . . ....... ..., e e e 57+ 2% V
Heater: Voltage . . ....... ..., e e e [2]
2
Heater: Voltage . . ....... ..., e e e 57+ 2% V
Current, at [1]
5.7 V
Current, at 5.7 volts . . . . .. v vt v i v e v s e e e . 0.95 A
Current, at [2]
0.95 V
Current, at 5.7 volts . . . . .. v vt v i v e v s e e e . 0.95 A
Amplification Factor (Average) ... .. e et ettt et ee
100
Amplification Factor (Average) ... .. e et ettt et ee 100
Direct Interelectrode Capacitance (grounded cathode)
2
Direct Interelectrode Capacitance (grounded cathode)2
Plate or Grid-Pulsed .. .......... et et e e
3000 MHz
Plate or Grid-Pulsed .. .......... et et e e 3000 MHz
Published value
2
2. Capacitance values are for a cold tube as measured in a special shielded fixture. When the cathode is heated to
the proper temperature, the grid-cathode capacitance will increase from the cold value by approximately
1 pF
the proper temperature, the grid-cathode capacitance will increase from the cold value by approximately 1 pf due
Published value [1]
3
3. Measured with one milliampere plate current and a plate voltage of 1 kVdc.
Published value [2]
1
3. Measured with one milliampere plate current and a plate voltage of 1 kVdc.
Heater: Current at [1]
5.7 V
Heater: Current at 5.7 volts . ... .... e e e e e .... 087 1.02 A
Heater: Current at [2]
87 V
Heater: Current at 5.7 volts . ... .... e e e e e .... 087 1.02 A
Heater: Current at [3]
1.02 V
Heater: Current at 5.7 volts . ... .... e e e e e .... 087 1.02 A
Published value
1
1. Capacitance values are for a cold tube as measured in a special shielded fixture.
FreQUeNCY . v v v v o v e ie e e ee v oo
1.09 GHz
FreQUeNCY . v v v v o v e ie e e ee v oo 1.090 GHz
DC PLATE VOLTAGE (grid pulsed) [1]
2500 V
DC PLATE VOLTAGE (grid pulsed). . 2500 VOLTS Heater Voltage . . . ... ... ... .... 5.7 V
DC PLATE VOLTAGE (grid pulsed) [2]
5.7 V
DC PLATE VOLTAGE (grid pulsed). . 2500 VOLTS Heater Voltage . . . ... ... ... .... 5.7 V
PEAK PULSE PLATE VOLTAGE DC Plate Voltage
2000
PEAK PULSE PLATE VOLTAGE DC Plate Voltage . . ............ 2000 vdc
(plate pulsed) .. ... ..nno
3500 V
(plate pulsed) .. ... ..nno... 3500 VOLTS te vortag
DC Grid Voltage
-75
DC Grid Voltage . ... .......... -75 Vdc
DC GRID VOLTAGE . . . v v v v vv e [1]
-150 V
DC GRID VOLTAGE . . . v v v v vv e -150 VOLTS Ponk VVideo Plate . 13 A
DC GRID VOLTAGE . . . v v v v vv e [2]
13 V
DC GRID VOLTAGE . . . v v v v vv e -150 VOLTS Ponk VVideo Plate . 13 A
Grid negative to cathode [1]
-750 V
Grid negative to cathode . . . ... -750 VOLTS Peak Video Grid Current .. ....... -8 a
Grid negative to cathode [2]
-8 V
Grid negative to cathode . . . ... -750 VOLTS Peak Video Grid Current .. ....... -8 a
Grid positive to cathode [1]
250 V
Grid positive to cathode . . . . .. 250 VOLTS Useful Power Output (approx.) .. . . .. 750 w
Grid positive to cathode [2]
750 V
Grid positive to cathode . . . . .. 250 VOLTS Useful Power Output (approx.) .. . . .. 750 w
PULSE PLATE CURRENT [1]
3 A
PULSE PLATE CURRENT. . . . . .. .. 3.0 AMPERES Pulse DUFLION .+ o o v oo e ee e e 0.5 us
PULSE PLATE CURRENT [2]
500 mA
PULSE PLATE CURRENT. . . . . .. .. 3.0 AMPERES Pulse DUFLION .+ o o v oo e ee e e 0.5 us
PULSE GRID CURRENT [1]
1.8 A
PULSE GRID CURRENT .. ....... 1.8 AMPERES Duty FACTOr .+« v v v vt ve e ve e e s 0.001
PULSE GRID CURRENT [2]
1 mA
PULSE GRID CURRENT .. ....... 1.8 AMPERES Duty FACTOr .+« v v v vt ve e ve e e s 0.001
Conduction and convection( [1]
7855 W
Conduction and convection(7855KAL) 10 WATTS PLATE PULSED AMPLIFIER
Conduction and convection( [2]
10 W
Conduction and convection(7855KAL) 10 WATTS PLATE PULSED AMPLIFIER
GRID DISSIPATION (Average) [1]
2 W
GRID DISSIPATION (Average). . . . . 2.0 WATTS Frequency . .. ... .. ... 1.1 GHz
GRID DISSIPATION (Average) [2]
1.1 W
GRID DISSIPATION (Average). . . . . 2.0 WATTS Frequency . .. ... .. ... 1.1 GHz
FREQUENCY [1]
2
FREQUENCY . . . 2 """""" 28 GSHZ Heater Voltage . .............. 5.7 V
FREQUENCY [2]
28
FREQUENCY . . . 2 """""" 28 GSHZ Heater Voltage . .............. 5.7 V
FREQUENCY [3]
5.7
FREQUENCY . . . 2 """""" 28 GSHZ Heater Voltage . .............. 5.7 V
F[;LLJJ"TSYEF%JCRT%E%N """""" [1]
33
F[;LLJJ"TSYEF%JCRT%E%N """""" 0033 Peak Plate Voltage .. ........... 2000 v
F[;LLJJ"TSYEF%JCRT%E%N """""" [2]
2000
F[;LLJJ"TSYEF%JCRT%E%N """""" 0033 Peak Plate Voltage .. ........... 2000 v
""""""" Peak Video Plate Current
1.8
""""""" Peak Video Plate Current .. .. ..... 1.8 a
Published value [1]
1
1. Using EIMAC radiator PN 158601. Peak Video Grid Current ... ...... 1.0 a
Published value [2]
158601
1. Using EIMAC radiator PN 158601. Peak Video Grid Current ... ...... 1.0 a
Published value [3]
1
1. Using EIMAC radiator PN 158601. Peak Video Grid Current ... ...... 1.0 a
Published value [1]
2
2. For applications using longer pulse duration and/or Pulse Duration . . . ............. 3.5 ps
Published value [2]
3.5
2. For applications using longer pulse duration and/or Pulse Duration . . . ............. 3.5 ps
higher duty cycle consult the nearest Varian Elec- Duty Factor
0.001
higher duty cycle consult the nearest Varian Elec- Duty Factor . . .. ............. . 0.001
the designated tube stop are shown in the outline The maximum plate dissipation of the
7855
the designated tube stop are shown in the outline The maximum plate dissipation of the 7855KAL
drawing. Electrical contact to the cathode, grid, is
10 W
drawing. Electrical contact to the cathode, grid, is 10 watts average power. This can be accomp-
Dimensions should never be taken from sample sipation of the [1]
7855
Dimensions should never be taken from sample sipation of the 7855AL in pulse service is 35
Dimensions should never be taken from sample sipation of the [2]
35
Dimensions should never be taken from sample sipation of the 7855AL in pulse service is 35
to cathode capacitance will be
15
to cathode capacitance will be 15%, or more,