8806

Cermolox beam-power tube for VHF television and linear RF amplification through roughly 400 MHz, providing high gain and multi-kilowatt broadcast output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 5.7 V / 125 A

Description

Cermolox beam-power tube for VHF-TV and linear RF power service through 400 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: 9
Nominal heater voltage: 5.7 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: 20
Max plate voltage: 8000 V
Max screen voltage: 1650 V
Max plate dissipation: 12500 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

1971 RCA HB3 Binder 6 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater/filament voltage
5.7 V
Heater/filament current
125 A
Maximum plate voltage
8000 V
Maximum screen voltage
1650 V
Maximum plate current
4 A
Plate dissipation
12500 W
Minimum heating time
15 s
Full-input frequency
400 MHz
Peak sync output
12500 W
VHF-TV
Linear carrier output
2500 W

Characteristic

Grid No.2 to grid No.1 mu factor
20

Construction

Cooling method
Forced air