Data set 01
195X Tesla
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Other
HeaterVoltageNominal
1.25 V
Nominal
HeaterCurrentNominal
26 mA
Nominal
Maximum Plate Voltage
10 V
Voltage Tetrode ·Tetrode
4NE9
Directly heated electrometer tetrode intended for very-low-current measurement. Its low-power filament and high input resistance suit sensitive instrumentation circuits.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 1.25 V / 26 mA
Description
Directly heated electrometer tetrode intended for measurement applications.
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
- 1.25 V
- Nominal heater current
- 26 mA
- 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
Tetrode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 12 V
Tesla 4NE9 directly heated oxide-coated electrometric tetrode for measuring circuits, filament 1.25 V at 26 mA (permitted filament voltage 1.1–1.3 V). Manufacturer clearly distinguishes anode typical 10 V from maximum anode 12 V, with space-grid voltage 8 V typical and maximum 10 V, control-grid bias approximately -2.5 V. Original text reports very low electrometric control-grid current about 3×10^-13 A, and gm as 60 nA/V (electrode-specific; do not promote to static gm without independent confirmation). Grid connection brought to bulb top for high insulation; silicone-treated glass must be handled using clean gloves. Modified S7/10 lead base, not inferred canonical socket code.
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.