Data set 01
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Thyratron
Other
Peak cathode current
8 A
Average cathode current
1 A
Fault cathode current
80 A
Peak inverse anode voltage
1250 V
Specialized - Thyratron ·Thyratron
6855
Directly heated gas-and-mercury-vapor negative-control thyratron for grid-controlled rectifier service, combining substantial peak current with triggered power conduction.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- 4D
- Socket code
- B9A
- Base pins
- 4
- Nominal heater
- 2.5 V / 800 mA
Description
RCA 716/6855 is a directly heated gas-and-mercury-vapor thyratron for grid-controlled rectifier service, rated for 1250-V peak forward/inverse anode voltage and high peak cathode current.
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
- 4D
- Socket code
- B9A
- Base pins
- 4
- Nominal heater voltage
- 2.5 V
- Nominal heater current
- 800 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
4D - 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
- 1250 V
- Max cathode current
- 1 A
- Rectifier forward voltage drop
- 8 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
6.3 A
Nominal
Maximum deionization time
1000 us
Maximum critical grid current
10 uA
Peak forward anode voltage
1250 V
Peak inverse anode voltage
1250 V
Peak negative grid voltage before conduction
500 V
Peak negative grid voltage during conduction
10 V
Peak anode/cathode current
8 A
Average anode/cathode current
1 A
Fault current
80 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
15 s
Ionization time
10 us
Approximate
Anode voltage drop
8 V
Capacitance
Grid-to-anode capacitance
3 pF
Approximate