Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Voltage Regulator
Characteristics
Burning Voltage Minimum
90 V
Burning Voltage Maximum
110 V
Other
Quiescent Current
20 mA
Voltage Regulator ·VoltageRegulator
4687A
Neon-filled cold-cathode stabilizing tube for shunt voltage regulation, with approximately 90–110 V burning voltage.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- -
Description
The Mullard 4687A is a neon-filled voltage-stabilising tube with a 90-110 V burning range.
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
- -
- Nominal heater current
- -
- 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
Voltage Regulator
X-ray radiationInterelectrode capacitances
- Regulator minimum current
- 10 mA
- Regulator maximum current
- 40 mA
- Regulator starting voltage
- 130 V
- Regulator maintaining voltage
- 100 V
- Regulator dynamic impedance
- 250 Ω
Published burning-voltage range 90-110 V; quiescent current 20 mA.
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.