Data set 01
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Capacitance
Interelectrode Capacitance
6 pF
Voltage Tetrode ·Tetrode
FP54
Directly heated space-charge-grid electrometer tube for measuring extremely small direct currents. Its specialized grid arrangement provides very high input resistance for precision instrumentation.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 2.5 V / 90 mA
Description
The FP54 is a space-charge-grid tube with very high input resistance and very low grid current for amplification and measurement of extremely small direct currents.
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
- 2.5 V
- Nominal heater current
- 90 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
- Plate resistance
- 45000 Ω
- Transconductance
- 0.00002 S
- Amplification factor
- 0.9
Typical-operation sheet; no maximum plate rating printed.
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.