8358

Fast-warm-up miniature twin beam-power tube designed for push-pull RF power amplification and frequency multiplication at frequencies to approximately 500 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9QR
Socket code: B9A
Base pins: 9
Nominal heater: 1.9 V / 3.15 A

Description

Miniature twin beam-power tube with directly heated cathode and short warm-up time, for push-pull RF power amplification or frequency multiplication up to 500 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: 9QR
Socket code: B9A
Base pins: 9
Nominal heater voltage: 1.9 V
Nominal heater current: 3.15 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9QR - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.01 S
Max plate voltage: 250 V
Max screen voltage: 200 V
Max plate dissipation: 7.5 W
Max screen dissipation: 3.5 W
Max cathode current: 120 mA

Representative row for two identical beam-power units.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.01 S
Max plate voltage: 250 V
Max screen voltage: 200 V
Max plate dissipation: 7.5 W
Max screen dissipation: 3.5 W
Max cathode current: 120 mA

Second identical physical beam-power section; added to align rows with SectionCount.

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

1961 Matsushita

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

Grid No. 1 to plate capacitance
0.15 pF
EachUnit
Grid No. 1 input capacitance
8 pF
EachUnit
Plate output capacitance
2 pF
EachUnit

Characteristics

Grid 2 to grid 1 mu-factor
30
EachUnit

Other

Typical plate voltage at 500 MHz
180 V
ClassC,PushPull
Typical plate current at 500 MHz
50 mA
ClassC,PushPull
Useful power output at 500 MHz
4.5 W
ClassC,PushPull