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Power - Beam (NOT sweep) (over 1000V 100W) ·BeamPower

8501

Forced-air-cooled Cermolox beam-power tube for UHF television and high-power RF service, capable of approximately 5.5 kW output near 890 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: -
Nominal heater: 4.5 V / 125 A

Description

Forced-air-cooled Cermolox beam-power tube for UHF television and high-power RF service, rated for about 5.5 kW RF output at 890 MHz.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: -
Nominal heater voltage: 4.5 V
Nominal heater current: 125 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

Amplification factor: 16
Max plate voltage: 7000 V
Max screen voltage: 1500 V
Max plate dissipation: 10000 W
Max screen dissipation: 150 W
Max grid dissipation: 100 W
Max cathode current: 4 A

Published screen-to-control-grid mu factor promoted.

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

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Filament voltage maximum
5 V
Filament starting current maximum
300 A
Plate voltage maximum
7000 V
CCS
Screen-grid voltage maximum
1500 V
CCS
Plate current maximum
4 A
CCS
Plate dissipation maximum
10000 W
CCS
Screen-grid input maximum
150 W
CCS
Control-grid input maximum
100 W
CCS
Plate voltage
5700 V
ClassB;Television;CathodeDrive;f=890MHz
Screen-grid voltage
1000 V
ClassB;Television;CathodeDrive;f=890MHz
Control-grid voltage
-40 V
ClassB;Television;CathodeDrive;f=890MHz
RF output power
5500 W
f=890MHz

Characteristics

Minimum heating time
15 s
Grid No.2 to grid No.1 mu factor
16 ratio
Va=1200V;Vg2=900V;Ia=8A

Capacitance

Grid No.1 to plate capacitance maximum
0.32 pF
Grid No.1 to filament capacitance
65 pF
Plate to filament capacitance maximum
0.04 pF
Grid No.1 to grid No.2 capacitance
70 pF
Grid No.2 to plate capacitance
13 pF

Data set 02

1971 RCA HB3 Binder 6 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater/filament voltage
4.5 V
Heater/filament current
125 A
Minimum heating time
15 s
Maximum plate voltage
7000 V
Maximum screen voltage
1500 V
Maximum plate current
4 A
Plate dissipation
10000 W
Typical plate voltage
5700 V
ClassBTV;890MHz
Typical screen voltage
1000 V
ClassBTV;890MHz
Useful power output
5500 W
890MHz

Characteristic

Grid No.2 to grid No.1 mu factor
16
Plate1200V;Screen900V;PlateCurrent8A

Capacitance

Grid No.1-to-plate capacitance
0.32 pF
Maximum
Grid No.1-to-filament capacitance
65 pF
Grid No.2-to-plate capacitance
13 pF