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Rectifier - Full Wave ·Rectifier-Rectifier

1729

Philips directly heated double-anode mercury-vapor/gas industrial rectifier designed particularly for battery chargers. Low forward voltage and multiampere output suit efficient high-current charging equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: GOLIATH
Socket code: -
Base pins: -
Nominal heater: 1.9 V / 8 A

Description

1729 — Double-Anode Rectifying Valve

The 1729 is a mercury vapour and gas-filled, double-anode rectifying valve designed for industrial applications, specifically battery charging systems. It is capable of delivering 6 A per valve and is rated for charging a maximum of 36 lead-acid (Pb) cells.

Mechanical Construction and Physical Dimensions

The 1729 is constructed with a glass envelope and requires a specific vertical mounting position with the base down. The physical dimensions and mechanical specifications of the valve include:

Maximum Diameter: 81 mm
Maximum Height: 240 mm
Net Weight: 250 g
Shipping Weight: 5700 g
Base Type: Goliath
Socket/Support: Type 65909 BG/01

The valve features a top anode connection with an M6 terminal. A side terminal (M4) is located on the bulb, positioned 70 mm above the base bottom and projecting outward by 20 mm. The valve also incorporates a screen (s), which must be connected directly to the cathode via an external 10 kΩ, 0.5 W resistor.

Filament and Heating Requirements

The 1729 utilizes a directly heated, oxide-coated filament. The electrical requirements and pre-heating times for the filament are strictly defined:

Parameter	Value
Filament Voltage ( $V_f$ )	1.9 V
Filament Current ( $I_f$ )	8 A
Recommended Pre-heating Time ( $T_w$ )	2 minutes

The pre-heating time ( $T_w$ ) is critical to ensure proper vaporization of the mercury before anode voltage is applied. Under urgent conditions, the pre-heating time may be decreased to a minimum of 1 minute. To automate this delay, a type 4152 time delay switch can be integrated into the circuit. Following transport or after a prolonged interruption of service, the pre-heating time must be extended to a minimum of 5 minutes.

Electrical Characteristics and Operating Limits

The electrical operation of the 1729 is characterized by low internal voltage drops typical of gas and mercury vapour rectifiers.

Typical Characteristics

Arc Voltage ( $V_{arc}$ ): 10 V
Ignition Voltage ( $V_{ign}$ ): 30 V

Limiting Values

The operating limits must be strictly observed to prevent damage to the valve:

Parameter	Limit Value
Maximum Transformer Voltage ( $V_{tr}$ )	95 $V_{eff}$ / 20 $V_{eff}$ (under Circuit a conditions)
Maximum Peak Inverse Anode Voltage ( $V_{ainv_p}$ )	300 V
Maximum Anode Current ( $I_a$ )	3 A
Maximum Peak Anode Current ( $I_{a_p}$ )	18 A
Minimum Surge-Limiting Resistance ( $R_t$ )	0.4 Ω
Operating Mercury Temperature Range ( $t_{Hg}$ )	30 to 80 °C

The minimum surge-limiting resistance ( $R_t$ ) of 0.4 Ω is required to protect the anodes from excessive current surges during operation.

Technical Summary

The 1729 is a specialized, directly heated, double-anode rectifying valve filled with mercury vapour and gas. Utilizing a Goliath base and designed for vertical, base-down mounting, it is optimized for heavy-duty battery charging applications up to 36 lead-acid cells. With a filament rating of 1.9 V at 8 A, the valve requires a carefully managed pre-heating delay of 2 minutes (extendable to 5 minutes after transport) to safeguard its oxide-coated filament. Its electrical limits include a maximum peak inverse voltage of 300 V, a maximum anode current of 3 A (18 A peak), and a required minimum series resistance of 0.4 Ω, operating within a controlled mercury temperature range of 30 to 80 °C.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: GOLIATH
Socket code: -
Base pins: -
Nominal heater voltage: 1.9 V
Nominal heater current: 8 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

GOLIATH - 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 300 V
Rectifier nominal output current: 6 A
Rectifier peak forward current: 18 A
Rectifier forward voltage drop: 10 V
Rectifier warm-up time: 120 s

Representative of two identical paths; application rating 6 A per valve and published Ia max 3 A per anode.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 300 V
Rectifier nominal output current: 6 A
Rectifier peak forward current: 18 A
Rectifier forward voltage drop: 10 V
Rectifier warm-up time: 120 s

Second physical rectifier section added to represent the full-wave/double-anode structure.

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

Maximum RMS anode supply voltage
95 V
Minimum RMS anode supply voltage
20 V
Maximum average anode current per anode
3 A
Minimum series resistance
0.4 ohm
Permitted mercury/ambient temperature
30 to 80 degC
DC output current
6 A

SECTION 2

Rectifier

Other

Maximum RMS anode supply voltage
95 V
Minimum RMS anode supply voltage
20 V
Maximum average anode current per anode
3 A
Minimum series resistance
0.4 ohm
Permitted mercury/ambient temperature
30 to 80 degC
DC output current
6 A