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Y581

Forced-air-cooled rugged planar triode, former 8907 designation, for CW/pulsed oscillator, multiplier, modulator, and regulator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 1 A

Description

EIMAC Y581 is explicitly identified as the former designation of 8907. Forced-air-cooled rugged planar triode for CW or pulsed oscillator, multiplier, modulator, and regulator service.

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: 6 V
Nominal heater current: 1 A
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: 0.038 S
Amplification factor: 80
Max plate voltage: 3500 V
Max plate dissipation: 100 W
Max grid dissipation: 1.5 W
Max cathode current: 7.5 A

Promoted values are taken from printed General Characteristics / Maximum Ratings. Additional published conditions and operating data are preserved 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

Capacitance

Grid-Cathode Capacitance
8 pF
Grid-Plate Capacitance
1.98 pF
Plate-Cathode Capacitance
0.06 pF

Other

Frequency CW Maximum
2.5 GHz
Peak Pulse Plate Voltage
4500 V
Pulse Plate Current
5 A

Data set 02

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage nominal
6 V
Heater current nominal
1 A
Transconductance
38000 uS
Amplification factor
80

Capacitance

Input/grid-cathode capacitance
8 pF
Output/plate-cathode capacitance
1.98 pF
Grid-plate/feedback capacitance
0.06 pF

Other

Maximum plate voltage
4500 V
Maximum plate dissipation
100 W
Maximum grid dissipation
1.5 W
Maximum cathode or pulse plate current
7.5 A
Maximum rated frequency
3 GHz
CW DC plate voltage
2500 V
CW
CW DC plate current
150 mA
CW
CW DC grid current
45 mA
CW
Forced-air plate dissipation
100 W
8907
Representative DC plate voltage
1000 V
GroundedGridCWOscillator
Representative useful CW output
30 W
GroundedGridCWOscillator
Representative frequency
2.5 GHz
GroundedGridCWOscillator
Pulse peak plate voltage
4500 V
Pulse
Pulse grid current
2.5 A
Pulse
Pulse duration
6 us
Pulse

Data set 03

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage nominal
6 V
Heater current nominal
1 A
Transconductance
38000 uS
Amplification factor
80

Capacitance

Input/grid-cathode capacitance
8 pF
Output/plate-cathode capacitance
1.98 pF
Grid-plate/feedback capacitance
0.06 pF

Other

Maximum plate voltage
4500 V
Maximum plate dissipation
100 W
Maximum grid dissipation
1.5 W
Maximum cathode or pulse plate current
7.5 A
Maximum rated frequency
3 GHz
CW DC plate voltage
2500 V
CW
CW DC plate current
150 mA
CW
CW DC grid current
45 mA
CW
Forced-air plate dissipation
100 W
8907
Representative DC plate voltage
1000 V
GroundedGridCWOscillator
Representative useful CW output
30 W
GroundedGridCWOscillator
Representative frequency
2.5 GHz
GroundedGridCWOscillator
Pulse peak plate voltage
4500 V
Pulse
Pulse grid current
2.5 A
Pulse
Pulse duration
6 us
Pulse