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1129

Directly heated Philips gas-filled industrial rectifier with oxide-coated filament for battery-charger service. Rated for approximately 185 V peak inverse voltage and 1.5 A nominal rectified output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.9 V / 5.5 A

Description

1129 — Gas-Filled Double-Anode Rectifying Valve

The 1129 is a gas-filled, double-anode rectifying valve designed primarily for industrial and battery charging applications. It is capable of charging a maximum of 20 lead-acid (Pb) cells, delivering a rectified current of up to 3 A per valve. The device features a directly heated, oxide-coated filament and is designed for vertical operation.

Mechanical Design, Mounting, and Base Connection

The 1129 is constructed with a glass envelope. Its physical dimensions are characterized by a maximum bulb diameter of 71 mm, a maximum overall height of 142 mm, and a maximum seated height of 124 mm. The net weight of the valve is approximately 75 g, while a bulk shipment of 50 valves has a gross weight of approximately 5200 g.

To ensure proper operation and heat dissipation, the valve must be mounted in a vertical position with the base facing down. It utilizes a Type A base and is designed to fit a type 40465 socket or support.

The electrical connections are distributed across the four-pin Base A configuration as follows:

Pin 3: Filament (f)
Pin 8: Filament (f)
Pin 10: Anode (a)
Pin 4: Anode (a')

Filament and Heating Requirements

The 1129 utilizes a directly heated, oxide-coated filament. The heating supply must be alternating current (A.C.). The electrical requirements for the filament are:

Parameter	Value
Filament Voltage ( $V_f$ )	1.9 V
Filament Current ( $I_f$ )	5.5 A
Recommended Pre-heating Time ( $t_w$ )	60 seconds

The recommended pre-heating time of 60 seconds is specified to ensure the filament reaches its proper operating temperature before anode voltage is applied. In urgent situations, this pre-heating period may be reduced to a minimum of 30 seconds.

Electrical Characteristics and Operating Limits

The typical operating characteristics of the gas-filled discharge path within the 1129 are defined by its arc and ignition voltages:

Arc Voltage ( $V_{arc}$ ): 9 V
Ignition Voltage ( $V_{ign}$ ): 16 V

To ensure reliable operation and prevent damage to the valve, the circuit must be designed to respect the following limiting values:

Parameter	Minimum	Maximum
Transformer Voltage ( $V_{tr}$ )	12 $V_{eff}$	60 $V_{eff}$
Peak Inverse Anode Voltage ( $V_{ainv p}$ )	—	185 V
Anode Current ( $I_a$ )	—	1.5 A
Peak Anode Current ( $I_{ap}$ )	—	9 A
Series Resistance ( $R_t$ )	2.5 \u03a9	—
Ambient Temperature ( $t_{amb}$ )	-55 \u00b0C	+75 \u00b0C

The minimum series resistance ( $R_t$ ) of 2.5 \u03a9 is required to limit the peak currents and protect the cathode from excessive ion bombardment during conduction. The transformer voltage limits are specified for standard operating circuits.

Technical Summary

The 1129 is a robust, gas-filled double-anode rectifier designed for low-voltage, high-current applications such as charging up to 20 lead-acid battery cells. Operating with a 1.9 V, 5.5 A directly heated filament, it requires a vertical, base-down mounting position using a Type A base. With a maximum average anode current of 1.5 A per anode (enabling 3 A total charging current per valve) and a peak anode current limit of 9 A, the 1129 provides efficient rectification with a low typical arc drop of 9 V and an ignition voltage of 16 V.

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: 1.9 V
Nominal heater current: 5.5 A
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

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 185 V
Rectifier nominal output current: 1.5 A
Rectifier peak forward current: 9 A
Rectifier warm-up time: 60 s

Gas-filled industrial rectifier with directly heated oxide-coated filament.

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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

MinimumSeriesResistance
2.5 ohm

Characteristics

TypicalArcVoltage
3 V
IgnitionVoltage
16 V