5GX7

Medium-mu triode and frame-grid sharp-cutoff pentode frequency converter for VHF television tuners.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 5.6 V / 450 mA

Description

Medium-mu triode and frame-grid sharp-cutoff pentode converter for VHF television tuners.

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: 5.6 V
Nominal heater current: 450 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: 0.013 S
Max plate voltage: 275 V
Max plate dissipation: 1.5 W
Max cathode current: 20 mA

Published Westinghouse ratings, characteristics, capacitances, and typical operating data promoted where applicable; additional values retained as parameters.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.011 S
Max plate voltage: 275 V
Max screen voltage: 275 V
Max plate dissipation: 2.2 W
Max screen dissipation: 0.45 W
Max cathode current: 20 mA

Published Westinghouse ratings, characteristics, capacitances, and typical operating data promoted where applicable; additional values retained as parameters.

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

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Triode typical plate voltage
125 V
Heater-cathode voltage maximum
200 V

Characteristics

Triode transconductance
13000 uS
Triode amplification factor
40
Triode plate resistance
5000 ohm
Heater warm-up time
11 s

Application

Application
Oscillator / phase inverter / vertical oscillator

Capacitance

Triode grid-to-plate capacitance
1.2 pF

SECTION 2

Pentode

Other

Pentode/tetrode typical plate voltage
250 V
Pentode/tetrode grid2 voltage
90 V

Characteristics

Pentode/tetrode transconductance
11000 uS
Pentode/tetrode plate resistance
150000 ohm

Application

Application
Mixer / IF / video / general-purpose amplifier

Capacitance

Pentode grid1-to-plate capacitance maximum
0.005 pF
Pentode input capacitance
5.4 pF
Pentode output capacitance
3.3 pF
Grid1-to-grid2 capacitance
1.6 pF