ZE025XS

Forced-air Tesla coaxial beam tetrode for RF amplification, modulation, and oscillator service to approximately 400 MHz, combining 250 W plate dissipation with very low feedback capacitance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 12.6 V / 1.75 A

Description

Coaxial power beam tetrode with indirectly heated cathode and 250 W anode dissipation for RF power amplification, modulation and oscillator service up to 400 MHz.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8G
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 1.75 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

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.024 S
Max plate voltage: 2000 V
Max screen voltage: 350 V
Max plate dissipation: 250 W
Max screen dissipation: 18 W
Max grid dissipation: 2 W

Maximum ratings: anode 2000 V (f < 300 MHz), anode dissipation 250 W, anode current 500 mA, screen 350 V/18 W, control-grid voltage magnitude 250 V, control-grid dissipation 2 W; maximum frequency 400 MHz.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

HeaterVoltageNominal
12.6 V
Nominal
HeaterCurrentNominal
1.75 A
Nominal
Maximum Plate Voltage
2000 V
Maximum Screen Voltage
350 V
Maximum Plate Dissipation
250 W
Maximum Frequency
400 MHz

Data set 02

1966 Tesla Tubes

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Anode Voltage
500 V
Characteristic data
Screen Grid Voltage
250 V
Characteristic data
Anode Current
400 mA
Characteristic data
Transconductance
24000 uS
Characteristic data
Ig2/Ig1 Ratio
5
Characteristic data; printed ratio label

Capacitance

Control Grid Capacitance (Cg1)
30 pF
Interelectrode capacitance
Anode Capacitance (Ca)
8 pF
Interelectrode capacitance
Anode-to-Control-Grid Capacitance (Ca/g1)
0.06 pF
Interelectrode capacitance

Other

Maximum Anode Current
500 mA
Maximum Control Grid Voltage Magnitude
250 V
Maximum Heater-Cathode Voltage
150 V
Maximum Frequency
400 MHz
Maximum Glass-to-Metal Seal Temperature
175 degC
Maximum Anode Cooling-Fin Temperature
250 degC
Weight
150 g

Cooling

Cooling Air Flow
0.1 m3/min
At full anode dissipation; ambient +20 C
Cooling Air Pressure Difference
6.5 mmH2O
Incoming-to-outgoing air pressure difference