Power - Triode ·Triode
High-power transmitting triode for RF amplification, oscillation, modulation, or related transmitter and industrial service.
The EIMAC 8938 is a rugged coaxial-base ceramic/metal high-mu power triode for vhf/uhf linear, power, and pulse amplification.
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 from printed general-characteristics and absolute-maximum-ratings blocks.
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.
Amplification factor
125
Transconductance
55000 uS
Maximum DC plate voltage
6000 V
Maximum plate dissipation
600 W
Maximum grid dissipation
25 W
Maximum pulse cathode current
10 A
Data set 02
Published operating points and test conditions from this source.
Heater voltage nominal
5 V
Heater current nominal
10.5 A
Transconductance
55000 uS
Amplification factor
125
Input/grid-cathode capacitance
39 pF
Output/plate-cathode capacitance
13 pF
Grid-plate/feedback capacitance
0.14 pF
Maximum plate voltage
4000 V
Maximum plate dissipation
1500 W
Maximum grid dissipation
25 W
Maximum cathode or pulse plate current
1 A
Maximum rated frequency
0.5 GHz
Maximum DC plate current
1 A
CW frequency of maximum ratings
500 MHz
Class AB2 plate voltage
3500 V
ClassAB2;CathodeDriven
Class AB2 single-tone plate current
970 mA
ClassAB2;CathodeDriven
Class AB2 useful output power
2030 W
ClassAB2;CathodeDriven
Class C plate voltage
3000 V
ClassC
Class C useful output power
1570 W
ClassC
Class C power gain
12.8 dB
ClassC
Data set 03
Published operating points and test conditions from this source.
Heater voltage nominal
5 V
Heater current nominal
10.5 A
Transconductance
55000 uS
Amplification factor
125
Input/grid-cathode capacitance
39 pF
Output/plate-cathode capacitance
13 pF
Grid-plate/feedback capacitance
0.14 pF
Maximum plate voltage
4000 V
Maximum plate dissipation
1500 W
Maximum grid dissipation
25 W
Maximum cathode or pulse plate current
1 A
Maximum rated frequency
0.5 GHz
Maximum DC plate current
1 A
CW frequency of maximum ratings
500 MHz
Class AB2 plate voltage
3500 V
ClassAB2;CathodeDriven
Class AB2 single-tone plate current
970 mA
ClassAB2;CathodeDriven
Class AB2 useful output power
2030 W
ClassAB2;CathodeDriven
Class C plate voltage
3000 V
ClassC
Class C useful output power
1570 W
ClassC
Class C power gain
12.8 dB
ClassC