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4690

Philips 4690 helium-filled indirectly heated thyratron for relaxation oscillators and time-base switching, with 4 V 1.3 A heater, 500 V peak anode rating and P30-X base.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: P30-X
Socket code: -
Base pins: -
Nominal heater: 4 V / 1.3 A

Description

The Philips 4690 is a helium-filled gas triode for controlled switching service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: P30-X
Socket code: -
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 1.3 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

P30-X - 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

Thyratron

X-ray radiationInterelectrode capacitances

Max plate voltage: 500 V
Max cathode current: 10 mA

Philips 4690 helium-filled grid-controlled thyratron. Oscillator/time-base maximum PEAK anode 500 V, peak anode current 750 mA, maximum peak anode-grid voltage 600 V, mean anode current in oscillating condition max 10 mA, arc voltage ~50 V, frequency max 150 kHz, grid resistor max 0.5 MΩ and min 1000 Ω per volt peak grid voltage, control ratio 35 (1948) or 40 (1938). Capacitances Cga 3.7 pF, Cak 2.0 pF, Cgk 3.7 pF. Rectifier operation with grid tied cathode has DIFFERENT limits: anode voltage max 350 V, anode current max 75 mA. Heater 4.0 V 1.3 A, indirectly heated; P30-X base. Max_plate_voltage 500 V is peak oscillator rating, not continuous DC.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Construction

Gas filling
Helium
Section1

Capacitance

Grid-to-anode capacitance
3.7 pF
Section1
Anode-to-cathode capacitance
2 pF
Section1
Grid-to-cathode capacitance
3.7 pF
Section1

Characteristic

Arc extinction voltage
50 V
Approximate
Minimum grid-circuit resistance per volt peak grid voltage
1000 Ω
TimeBase
Striking-voltage to grid-voltage ratio
40
TimeBase

Other

Maximum peak voltage between electrodes
600 V
TimeBase
Maximum peak anode voltage
500 V
TimeBase
Maximum peak anode current
750 mA
TimeBase
Maximum mean anode current
10 mA
OscillatingCondition
Maximum grid-circuit resistance
0.5 MΩ
TimeBase
Maximum filament-to-cathode voltage
100 V
CathodePositive
Maximum attainable frequency
150000 Hz
TimeBase

Data set 02

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristics

Arc Voltage
50 V

Other

Peak Anode Voltage
500 V
Peak Anode Current
750 mA
Average Anode Current
10 mA

Data set 03

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Gas filling
Helium
Peak voltage anode-grid
600 V
Mean anode current oscillating
10 mA
Maximum frequency
150 kHz
Rectifier plate voltage max
350 V
RectifierService
Rectifier plate current max
75 mA
RectifierService

Capacitance

Anode-cathode capacitance
7 pF

Characteristic

Control ratio
35