Power - Triode (over 1000V 100W) ·Triode
High-mu external-anode power triode intended for zero-bias Class B audio or RF amplification, including grounded-grid service. It offers high power gain and multi-kilowatt output with full ratings to approximately 75 MHz.
The Eimac 3X3000A7 is a high-mu external-anode power triode intended for zero-bias Class-B audio or radio-frequency amplifier service, including grounded-grid operation.
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
Highest applicable published rating promoted; service-specific CW, RF, audio, industrial, and pulse limits retained as parameter rows.
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.
Frequency for Maximum Ratings
75 MHz
Maximum DC Plate Current
2.5 A
Class-B maximum
Typical Maximum-Signal Plate Output Power
11000 W
Class-B grid-driven, two tubes, 4000 V plate
Grid-Filament Capacitance
38 pF
Grid-Plate Capacitance
24 pF
Plate-Filament Capacitance
0.6 pF
Data set 02
Published operating points and test conditions from this source.
Heater/filament voltage
7.5 V
Heater/filament current
51 A
Amplification factor
200
Input/grid-cathode capacitance
38 pF
Output/plate-cathode capacitance
0.6 pF
Feedback/grid-plate capacitance
24 pF
Maximum plate voltage
5000 V
Maximum plate dissipation
3000 W
Maximum grid dissipation
225 W
Maximum plate/cathode current
2.5 A
Frequency for maximum ratings
75 MHz
Typical grounded-grid plate voltage
5000 V
ClassB
Typical grounded-grid plate current
1.56 A
ClassB
Typical power gain
20 x
GroundedGrid