RE025XA

Forced-air-cooled 250-watt coaxial power-beam transmitting tetrode designed for RF and VHF service, using a gold-plated molybdenum grid structure.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 6 V / -

Description

Indirectly heated 250 W coaxial power-beam transmitting tetrode for RF/VHF service, using a gold-plated molybdenum grid structure and forced-air cooling.

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: 6 V
Nominal heater current: -
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: 0.012 S
Max plate voltage: 2000 V
Max screen voltage: 400 V
Max plate dissipation: 250 W
Max screen dissipation: 12 W
Max grid dissipation: 2 W
Max cathode current: 250 mA

Promoted ratings taken from printed Maximum Ratings blocks; source filename/content mismatch handled by printed designation.

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

Capacitance

Control-grid input capacitance
16 pF
Published interelectrode capacitance
Plate output capacitance
4.5 pF
Published interelectrode capacitance

Other

Maximum frequency
500 MHz
Published maximum/rated frequency
Heater data
6 V; 2.3-2.9 A
Published heater voltage/current range or limit

Data set 02

1966 Tesla Tubes

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6 V
Maximum plate voltage
2000 V
Maximum screen-grid voltage
400 V
Maximum plate dissipation
250 W
Maximum screen-grid dissipation
12 W
Maximum control-grid dissipation
2 W
Maximum frequency
500 MHz
Heater current
2.3 A to 2.9 A
Heater warm-up time
60 s

Capacitance

Control-grid to cathode capacitance
16 pF
Anode capacitance
4.5 pF

Characteristic

Transconductance
12000 uS
Minimum; Ua=500 V; Ug2=250 V; Ia=200 mA
Screen-to-control-grid voltage ratio
5