AX9905

High-power transmitting tetrode designed for RF power amplification, linear amplification, oscillation, modulation, or frequency multiplication.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 680 mA

Description

The Amperex 5895/AX-9905 is a twin four-electrode tube for RF power amplification, oscillation, modulation, and frequency multiplication. Each directly heated oxide-cathode unit is radiation cooled and has published continuous and intermittent plate-dissipation ratings.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 680 mA
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

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Max plate voltage: 600 V
Max screen voltage: 250 V
Max plate dissipation: 8 W
Max cathode current: 240 mA

One representative section emitted for two electrically identical tetrode units.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

Max plate voltage: 600 V
Max screen voltage: 250 V
Max plate dissipation: 8 W
Max cathode current: 240 mA

Second identical physical Tetrode section; added to align physical 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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Amplification factor, grid No. 2 to grid No. 1
60 to 90
Published source value

Other

Maximum continuous peak cathode current
240 mA
Published source value
Maximum intermittent peak cathode current
300 mA
Published source value
Maximum operating frequency at full ratings
186 MHz
Published source value