Data set 01
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristic
Forward Voltage Drop at 20 mA
90 V
Rectifier - Half Wave ·Rectifier
FP85A
Directly heated high-vacuum rectifier for specialized high-voltage, low-current supplies. Its heavy filament and roughly 20 kV inverse-voltage capability suit professional equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B4B
- Base pins
- -
- Nominal heater
- 10 V / 5 A
Description
The FP85A is a high-vacuum rectifier for applications requiring up to 20,000 volts peak inverse at low current.
Socket description
Medium 4-pin bayonet
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B4B
- Base pins
- -
- Nominal heater voltage
- 10 V
- Nominal heater current
- 5 A
- 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
Rectifier
X-ray radiationInterelectrode capacitances
- Rectifier peak inverse voltage
- 20000 V
- Rectifier nominal output current
- 20 mA
- Rectifier peak forward current
- 100 mA
Printed rectifier ratings promoted.
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.