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Voltage Regulator ·VoltageRegulator

OA2

Widely used 150 V gas-filled regulator operating over roughly 5–30 mA for heaterless shunt stabilization and reference service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
5B0
Socket code
B7G
Base pins
7
Nominal heater
-

Description

The Philips OA2 is a cold-cathode voltage stabiliser.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
5B0
Socket code
B7G
Base pins
7
Nominal heater voltage
-
Nominal heater current
-
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

5B0 - 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

Voltage Regulator

X-ray radiationInterelectrode capacitances
Regulator voltage
150 V
Regulator minimum current
5 mA
Regulator maximum current
35 mA
Regulator starting voltage
185 V
Regulator maintaining voltage
150 V
Regulator dynamic impedance
400 Ω

Published electrical characteristics preserved in parameter rows; regulator-specific fields promoted where applicable.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristic

  • Nominal stabilising voltage

    150 V

    Published datasheet value

  • DC operating current minimum

    5 mA

    Published datasheet value

Other

  • DC operating current maximum

    30 mA

    Published datasheet value

Data set 02

1950 General Electric Transmitting Types

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Other

  • Anode Supply Voltage

    185 V

Data set 03

1953 AEG

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Construction

  • Filling

    Inert gas

Other

  • Maximum starting current

    75 mA

    10s

Data set 04

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristic

  • Nominal maintaining voltage

    150 V

  • Voltage variation over current range

    4.5 V

Other

  • Current range

    5 to 30 mA

  • Nominal current

    17.5 mA

Data set 05

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristics

  • Operating Voltage

    150 V

Other

  • Ignition Voltage Maximum

    185 V

Data set 06

1962 Cerberus

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Other

  • Breakdown voltage A-K

    180 V

  • Typical supply voltage

    360 V

  • Typical operating current

    15 mA

Characteristics

  • Stabilized voltage at 30 mA

    165 V

  • Stabilized voltage at 5 mA

    142 V

  • Operating current

    5 to 30 mA

  • Regulation over 5-30 mA

    6 V

  • RMS noise voltage

    5 mV

    5-30 mA

  • Life expectancy

    10000 to - h

    Exceeding

Data set 07

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Characteristic

  • Maintaining voltage at 17.5 mA

    144 to 160 V

  • Nominal maintaining voltage

    150 V

  • Ignition voltage

    - to 180 V

    Typical maximum

  • Voltage regulation

    - to 6 V

    Ia=5-30mA

Other

  • Absolute maximum ignition voltage

    - to 185 V

  • Operating current minimum

    5 mA

    LowerLimit

  • Operating current maximum

    35 mA

    UpperLimit

  • Maximum starting current

    - to 75 mA

    Tav<=10s

  • Maximum shunt capacitance

    - to 0.1 uF

Data set 08

1971 RCA HB3 Binder 2 of 7

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Other

  • Average starting current

    75 mA

  • DC cathode current

    5 mA to 30 mA

  • Ambient temperature range

    -55 to +90 C

  • Maximum shunt capacitance

    0.1 uF

  • Minimum DC anode supply voltage

    185 V

Characteristic

  • Anode breakdown / starting voltage

    185 V

  • Anode voltage drop

    140 to 168 V

  • Regulation over specified cathode-current range

    - to 6 V