Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode
High-power beam tetrode intended for RF amplification in broadcast, communications, or industrial transmitter service, with ratings suited to sustained power operation.
Long-life forced-air external-anode radial-beam power tetrode.
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
Promoted values are taken from printed General Characteristics / Maximum Ratings. Additional published conditions and operating data are preserved in parameters.
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.
Input Capacitance
17 pF
Output Capacitance
4.5 pF
Feedback Capacitance
0.04 pF
Cathode-Heater Potential Maximum
150 V
Frequency Maximum
500 MHz
Maximum DC Plate Current
250 mA
Typical Plate Output Power
390 W
ClassC;Frequency<=175MHz
Data set 02
Published operating points and test conditions from this source.
The
8876
The 8876 is a ceramic/metal forced-air cooled, external-anode radial-
beam tetrode with a maximum plate dissipation rating of
250 W
beam tetrode with a maximum plate dissipation rating of 250 watts and a
maximum input-power rating of [1]
500 W
maximum input-power rating of 500 wattso The 8876 is designed for very
maximum input-power rating of [2]
8876 W
maximum input-power rating of 500 wattso The 8876 is designed for very
Heater: Voltage [1]
6 V
Heater: Voltage ....................... 6.0 ± 0.3
Heater: Voltage [2]
0.3 V
Heater: Voltage ....................... 6.0 ± 0.3
Current, at [1]
6 A
Current, at 6.0 volts ............... 2.4
Current, at [2]
2.4 A
Current, at 6.0 volts ............... 2.4
Cathode-Heater Potential, maximum ...., ±
150
Cathode-Heater Potential, maximum ...., ±150
Grid to Screen
5
Grid to Screen ........................ 5
Direct Interelectrode Capacitances ( grounded cathode)
2 pF
Direct Interelectrode Capacitances ( grounded cathode) 2
Direct Interelectrode Capacitances (grounded grid and screen)
2 pF
Direct Interelectrode Capacitances (grounded grid and screen)2
Published value
2 pF
2. Capacitance values are for a cold tube as measured in a special shielded fixture in accordance with Electronic ln-
Ceramic/Metal Seals
250
Ceramic/Metal Seals ...... ...... 250OC
Anode Core
250
Anode Core ............ ...... 250OC
RADIO FREQUENCY LINEAR AMPLIFIER TYPICAL OPERATION (Frequencies to
175 MHz
RADIO FREQUENCY LINEAR AMPLIFIER TYPICAL OPERATION (Frequencies to 175 MHz)
MAXIMUM PIATINGS: Grid Voltage
1 V
MAXIMUM PIATINGS: Grid Voltage 1 .........
DC PLATE VOLTAGE
2000 V
DC PLATE VOLTAGE 2000 VOLTS Two-Tone Plate Current . . .
DC SCREEN VOLTAGE
400 V
DC SCREEN VOLTAGE 400 VOLTS Single-Tone Screen Current2
DC GRID VOLTAGE
-250 V
DC GRID VOLTAGE -250 VOLTS
DC PLATE CURFIENT
0.25 V
DC PLATE CURFIENT 0.25 AMPERE Peak rf Grid Voltage2 ....
PLATE DISSIPATION
250 W
PLATE DISSIPATION 250 WATTS
SCREEN DISSIPATION
12 W
SCREEN DISSIPATION 12 WATTS
Published value
1 A
1. Adjust to specif ied zero-signal dc plate current.
GF`lD DISSIPATION [1]
2 W
GF`lD DISSIPATION . 2 WATTS 2. Approximate value.
GF`lD DISSIPATION [2]
2 W
GF`lD DISSIPATION . 2 WATTS 2. Approximate value.
RADIO FREQUENCY LINEAR AMPLIFIER TYPICAL OPEFIATION (Frequencies to
175 MHz
RADIO FREQUENCY LINEAR AMPLIFIER TYPICAL OPEFIATION (Frequencies to 175 MHz)
DC PLATE VOLTAGE ,
2000 V
DC PLATE VOLTAGE , 2000 VOLTS
DC SCBEEN VOLTAGE
400 V
DC SCBEEN VOLTAGE 400 VOLTS Carrier Screen Current . .
DCGRIDVOLTAGE ,
-250 V
DCGRIDVOLTAGE , -250 VOLTS Peak rf Grid Voltage2 . .
DC PLATE CuPPIENT ,
0.25 W
DC PLATE CuPPIENT , 0.25 AMPEF}E Plate Output Power ....
PLATE DISSIPATION ,
250 W
PLATE DISSIPATION , 250 WATTS
SCREEN DISSIPATION [1]
12 A
SCREEN DISSIPATION 12 WATTS 1. Adjust to specified zero-signal dc plate current.
SCREEN DISSIPATION [2]
1 A
SCREEN DISSIPATION 12 WATTS 1. Adjust to specified zero-signal dc plate current.
GRID DISSIPATION [1]
2 W
GRID DISSIPATION . 2 WATTS 2. Approximate value
GRID DISSIPATION [2]
2 W
GRID DISSIPATION . 2 WATTS 2. Approximate value
RADIO FREQUENCY POWER AMPLIFIER TYPICAL OPEF`ATION (Frequencies to [1]
175 MHz
RADIO FREQUENCY POWER AMPLIFIER TYPICAL OPEF`ATION (Frequencies to 175 MHz) 500 MHz
RADIO FREQUENCY POWER AMPLIFIER TYPICAL OPEF`ATION (Frequencies to [2]
500 MHz
RADIO FREQUENCY POWER AMPLIFIER TYPICAL OPEF`ATION (Frequencies to 175 MHz) 500 MHz
Plate Voltage [1]
50010001500 V
Plate Voltage ....... 50010001500 2000 2000 Vdc
Plate Voltage [2]
2000 V
Plate Voltage ....... 50010001500 2000 2000 Vdc
Plate Voltage [3]
2000 V
Plate Voltage ....... 50010001500 2000 2000 Vdc
Class C Telegraphy or FM Telephony ScreenVoltage [1]
250 V
Class C Telegraphy or FM Telephony ScreenVoltage ...... 250 250 250 250 300 Vdc
Class C Telegraphy or FM Telephony ScreenVoltage [2]
250 V
Class C Telegraphy or FM Telephony ScreenVoltage ...... 250 250 250 250 300 Vdc
Class C Telegraphy or FM Telephony ScreenVoltage [3]
250 V
Class C Telegraphy or FM Telephony ScreenVoltage ...... 250 250 250 250 300 Vdc
Class C Telegraphy or FM Telephony ScreenVoltage [4]
250 V
Class C Telegraphy or FM Telephony ScreenVoltage ...... 250 250 250 250 300 Vdc
Class C Telegraphy or FM Telephony ScreenVoltage [5]
300 V
Class C Telegraphy or FM Telephony ScreenVoltage ...... 250 250 250 250 300 Vdc
(Key-Down Conditions) Gridvoltage [1]
90 V
(Key-Down Conditions) Gridvoltage .......- 90 -90 -90 -90 -90 Vdc
(Key-Down Conditions) Gridvoltage [2]
-90 V
(Key-Down Conditions) Gridvoltage .......- 90 -90 -90 -90 -90 Vdc
(Key-Down Conditions) Gridvoltage [3]
-90 V
(Key-Down Conditions) Gridvoltage .......- 90 -90 -90 -90 -90 Vdc
(Key-Down Conditions) Gridvoltage [4]
-90 V
(Key-Down Conditions) Gridvoltage .......- 90 -90 -90 -90 -90 Vdc
(Key-Down Conditions) Gridvoltage [5]
-90 V
(Key-Down Conditions) Gridvoltage .......- 90 -90 -90 -90 -90 Vdc
PlateCurrent [1]
250 mA
PlateCurrent ....... 250 250 250 250 250 mAdc
PlateCurrent [2]
250 mA
PlateCurrent ....... 250 250 250 250 250 mAdc
PlateCurrent [3]
250 mA
PlateCurrent ....... 250 250 250 250 250 mAdc
PlateCurrent [4]
250 mA
PlateCurrent ....... 250 250 250 250 250 mAdc
PlateCurrent [5]
250 mA
PlateCurrent ....... 250 250 250 250 250 mAdc
Screencurrentl [1]
45 mA
Screencurrentl ..... 45 38 21 19 1 0 mAdc2
Screencurrentl [2]
38 mA
Screencurrentl ..... 45 38 21 19 1 0 mAdc2
Screencurrentl [3]
21 mA
Screencurrentl ..... 45 38 21 19 1 0 mAdc2
Screencurrentl [4]
19 mA
Screencurrentl ..... 45 38 21 19 1 0 mAdc2
Screencurrentl [5]
1 mA
Screencurrentl ..... 45 38 21 19 1 0 mAdc2
Screencurrentl [6]
0 mA
Screencurrentl ..... 45 38 21 19 1 0 mAdc2
Gridcurrentl [1]
35 mA
Gridcurrentl ....... 35 31 28 26 25 mAdc2
Gridcurrentl [2]
31 mA
Gridcurrentl ....... 35 31 28 26 25 mAdc2
Gridcurrentl [3]
28 mA
Gridcurrentl ....... 35 31 28 26 25 mAdc2
Gridcurrentl [4]
26 mA
Gridcurrentl ....... 35 31 28 26 25 mAdc2
Gridcurrentl [5]
25 mA
Gridcurrentl ....... 35 31 28 26 25 mAdc2
PeakrfGridvoltagel
114114000000 V
PeakrfGridvoltagel..114114112112 .--V
DC PLATE VOLTAGE
2000 V
DC PLATE VOLTAGE 2000 VOLTS Measured Driving
DC SCREEN VOLTAGE [1]
300 V
DC SCREEN VOLTAGE 300 VOLTS power 1 .......
DC SCREEN VOLTAGE [2]
1 V
DC SCREEN VOLTAGE 300 VOLTS power 1 .......
DC GF`lD VOLTAGE
-250 V
DC GF`lD VOLTAGE -250 VOLTS Plate Input Power
DC PLATE CURF}ENT
0.25 W
DC PLATE CURF}ENT 0.25 AMPERE Plate Output Power
SCREEN DISSIPATION [1]
12 W
SCREEN DISSIPATION 12 WATTS 1. Approximate value.
SCREEN DISSIPATION [2]
1 W
SCREEN DISSIPATION 12 WATTS 1. Approximate value.
GF`lD DISSIPATION [1]
2 W
GF`lD DISSIPATION 2 WATTS 2, Measured values for a typical cavity amplifier circuit.
GF`lD DISSIPATION [2]
2 W
GF`lD DISSIPATION 2 WATTS 2, Measured values for a typical cavity amplifier circuit.
Screen Current
3 A
Screen Current 3 ......
DC PLATE VOLTAGE [1]
1500 V
DC PLATE VOLTAGE 1500 VOLTS Grid Current 3 ........
DC PLATE VOLTAGE [2]
3 V
DC PLATE VOLTAGE 1500 VOLTS Grid Current 3 ........
DC SCREEN VOLTAGE
300 V
DC SCREEN VOLTAGE 300 VOLTS Peak rf Grid Voltage3. . .
DC GFilD VOLTAGE
-250 V
DC GFilD VOLTAGE -250 VOLTS Calculated Driving Power
DC PLATE CURRENT
200 mA
DC PLATE CURRENT . 0.20 AMPEPIE Plate Input Power .....
PLATE DISSIPATIONT [1]
165 W
PLATE DISSIPATIONT ..... 165 WATTS 1. Corresponds to 250 watts at 100°/o sine-wave modulation.
PLATE DISSIPATIONT [2]
1 W
PLATE DISSIPATIONT ..... 165 WATTS 1. Corresponds to 250 watts at 100°/o sine-wave modulation.
PLATE DISSIPATIONT [3]
250 W
PLATE DISSIPATIONT ..... 165 WATTS 1. Corresponds to 250 watts at 100°/o sine-wave modulation.
PLATE DISSIPATIONT [4]
100 W
PLATE DISSIPATIONT ..... 165 WATTS 1. Corresponds to 250 watts at 100°/o sine-wave modulation.
SCF{EEN DISSIPATION2 [1]
12 W
SCF{EEN DISSIPATION2 ........... 12 WATTS 2. Average, with or without modulation.
SCF{EEN DISSIPATION2 [2]
2 W
SCF{EEN DISSIPATION2 ........... 12 WATTS 2. Average, with or without modulation.
GRID DISSIPATION2 [1]
2 W
GRID DISSIPATION2 ............ 2 WATTS 3. Approximate value.
GRID DISSIPATION2 [2]
3 W
GRID DISSIPATION2 ............ 2 WATTS 3. Approximate value.
Grid Voltage [1]
1 V
Grid Voltage 1 /3 ...........
Grid Voltage [2]
3 V
Grid Voltage 1 /3 ...........