Data set 01
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Thyratron
Other
Peak cathode current
77 A
Average cathode current
6 A
Fault cathode current
770 A
Peak inverse anode voltage
1500 V
Specialized - Thyratron ·Thyratron
6858
Large directly heated gas-and-mercury-vapor negative-control thyratron for grid-controlled rectifier service, providing very high peak-current capability.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- 4BZ
- Socket code
- B9A
- Base pins
- 4
- Nominal heater
- 2.5 V / 21 A
Description
RCA 760/6858 is a large directly heated gas-and-mercury-vapor thyratron for grid-controlled rectifier service, with 1500-V peak anode ratings and very high peak current capability.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 4BZ
- Socket code
- B9A
- Base pins
- 4
- Nominal heater voltage
- 2.5 V
- Nominal heater current
- 21 A
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
4BZ - 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
Thyratron
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 1500 V
- Max cathode current
- 6 A
- Rectifier forward voltage drop
- 12 V
Thyratron has no canonical SectionType; Other used. MaxCathodeCurrent uses published maximum average cathode current; peak/fault currents preserved separately.
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
1971 RCA HB3 Binder 2 of 7
Published operating points and test conditions from this source.
SECTION 1
Thyratron
Other
Filament voltage
2.5 V
Nominal
Filament current
21 A
Nominal
Maximum deionization time
1000 us
Maximum critical grid current
10 uA
Peak forward anode voltage
1500 V
Peak inverse anode voltage
1500 V
Peak negative grid voltage before conduction
500 V
Peak negative grid voltage during conduction
10 V
Peak anode/cathode current
77 A
Average anode/cathode current
6.4 A
Fault current
770 A
Short-duration fault rating
Ambient or condensed-mercury operating temperature range
-40 to +80 condensed-mercury operating range C
Characteristic
Minimum heating time prior to tube conduction
60 s
Ionization time
10 us
Approximate
Anode voltage drop
12 V
Capacitance
Grid-to-anode capacitance
4 pF
Approximate