Specialized - Thyratron ·Thyratron
Large directly heated xenon negative-control thyratron for high-current grid-controlled rectifier service, handling ampere-class average current and high peak conduction.
RCA C6J/5C21 is a large directly heated xenon negative-control thyratron intended for grid-controlled rectifier service with 77-A peak and 6.4-A average anode-current ratings.
A-type industrial rectifier base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Xenon thyratron; applicable rectifier-like conduction ratings promoted from the published specification.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heating time
60 s
Published datasheet value
Critical grid current
10 uA
Published datasheet value
Continuously recurring peak current
77 A
Oscillograph peak
Data set 02
Published operating points and test conditions from this source.
Heater Current
17 A to 23 A
Operating Temperature
-55 to 75 C
Tube Voltage Drop
14 V
Anode current=6.4A
Peak Emission Voltage Drop
45 V
Anode current=100A
Critical Grid Voltage
-7.5 to -3 V
Anode=1000V
Critical Anode Voltage
75 V
Grid=+3V; conduction below this value
Rated Anode Current Continuous
6.4 A
Rated Anode Current Average
6.4 A
Rated Anode Current 15-Second
12.8 A
15s on / 15s off
Peak Anode Current
100 A
Continuously oscillographically recorded
Peak Forward Voltage
1000 V
Peak Inverse Voltage
1250 V
Data set 03
Published operating points and test conditions from this source.
Filament voltage
2.5 V
Nominal
Filament current
21 A
Nominal
Maximum deionization time
1000 us
Maximum critical grid current
10 uA
Maximum anode voltage drop at end of life
12 V
Maximum commutation factor
0.66 VA/us^2
Peak forward anode voltage
750 V
Peak inverse anode voltage
1250 V
Peak negative grid voltage before conduction
100 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
-55 to +75 C
Minimum heating time prior to tube conduction
60 s
Anode voltage drop at beginning of life
9 V
Grid control ratio
210
Approximate; stated grid-resistor and DC conditions
Grid-to-anode capacitance
4 pF
Approximate
Grid-to-cathode capacitance
21 pF
Approximate