GVL91

Dual triode explicitly presented as an equivalent or co-designation of B329, intended for low-frequency amplification, oscillator, and phase-inverter circuitry.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.6 V / 150 mA

Description

GVL91 is explicitly presented on the source as an equivalent or co-designation of B329.

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: 12.6 V
Nominal heater current: 150 mA
Parallel heater voltage: 6.3 V
Parallel heater current: 300 mA
Series capable: Yes

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: 0.0022 S
Amplification factor: 17
Max plate voltage: 300 V
Max plate dissipation: 2.75 W

Representative section for two equal triode systems.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0022 S
Amplification factor: 17
Max plate voltage: 300 V
Max plate dissipation: 2.75 W

Second physical triode 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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Series heater voltage
12.6 V
Series heater current
150 mA
Parallel heater voltage
6.3 V
Parallel heater current
300 mA
Maximum plate voltage
300 V
Maximum plate dissipation per section
2.75 W
Typical plate voltage
250 V

Characteristic

Amplification factor
17
Transconductance
2200 uS

Capacitance

Grid-plate capacitance
1.5 pF
Grid-cathode capacitance
1.6 pF
Plate-cathode capacitance
0.5 pF