X109

Triode-hexode frequency changer for receiver operation to approximately 100 MHz. The triode provides local oscillation while the hexode performs conversion, making it suitable for VHF-capable superheterodyne front ends.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 19 V / 100 mA

Description

Triode-hexode frequency changer for operation to 100 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: 19 V
Nominal heater current: 100 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0028 S
Amplification factor: 22
Max plate voltage: 100 V

Marconi X109 miniature triode-hexode frequency changer to about 100 MHz, using 19 V, approximately 100 mA indirect heater. Oscillator triode maximum anode voltage 100 V, typical gm 2.8 mA/V and amplification factor 22 at 100 V anode and zero grid bias. Distinguish oscillator anode voltage from frequency-converter hexode anode voltage.

Section 2

Hexode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max screen voltage: 100 V

Marconi X109 triode-hexode frequency changer: converter hexode anode rating 250 V and screen rating 100 V. Intended service to around 100 MHz; operating examples use lower supply values. The oscillator triode has a distinct maximum anode voltage of 100 V. Manufacturer heater 19 V, approximately 100 mA. Keep conversion slope separate from ordinary intrinsic gm.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

Oscillator section function
Local oscillator

Other

Oscillator anode voltage
100 V

SECTION 2

Hexode

Construction

Mixer section identity
Hexode

Other

Mixer anode voltage
250 V
Mixer screen voltage
100 V

Application

Frequency-changer service
Explicit

Characteristic

Maximum operating frequency
100 MHz