Data set 01
1953 Amperex
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Other
Operating voltage at 6 mA
83 to 87 V
Characteristics
AC resistance at 6 mA
300 ohm
Voltage Regulator ·VoltageRegulator
85A2
Cold-cathode gas-discharge stabilizer maintaining approximately 85 V for heaterless reference and regulated-voltage service in electronic and measurement circuits.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- Miniature
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- -
Description
The Philips 85A2 is a cold-cathode voltage stabilising or reference tube operating near 85 V.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- Miniature
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- -
- Nominal heater current
- -
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Miniature - 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
- 85 V
- Regulator minimum current
- 1 mA
- Regulator maximum current
- 10 mA
- Regulator starting voltage
- 125 V
- Regulator maintaining voltage
- 85 V
- Regulator dynamic impedance
- 300 Ω
Gas-discharge device.
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 02
1953 RFT Rundfunk Technik
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristic
Nominal maintaining voltage
85 V
Lifetime voltage change
0.5 %
Other
Current range
1 to 10 mA
Nominal current
6 mA
Data set 03
1957 Philips Receiving and Amplifying Tubes
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristics
Maintaining/Reference Voltage
85 V
Other
Minimum Current
1 mA
Maximum Current
10 mA
Ignition Voltage Maximum
125 V
Data set 04
1962 Cerberus
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristics
Stabilized voltage
83 to 87 V
5.5mA
Regulation maximum
4 V
1-10mA
Temperature coefficient
-2.2 mV/C
IA=5.5mA
Initial drift
0.15 %
2min
Stabilized-voltage change over 20000 h maximum
1 V
Service life minimum
30000 h
Data set 05
1963 Philips Electron Tubes Handbook V2
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristic
Maintaining voltage at 5.5 mA
83 to 87 V
Voltage regulation
- to 4 V
Ia=1-10mA
Temperature coefficient
-2.7 mV/degC
Data set 06
1971 Mullard Gas Filled Tubes
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristic
Incremental resistance
300 ohm
Data set 07
1999 Philips 0-D
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristics
Maintaining voltage range
83 to 87 V
Published datasheet value
Maximum regulation
- to 4 V
1–10 mA
Temperature coefficient
-2.7 mV/°C
Published datasheet value
Other
Recommended operating current
5.5 mA
Published datasheet value