Product Specifications
L3Harris offers standard models from < 2” to 6” diameter with a variety of options available. Please contact the factory for special requirements for Excelitas cross references. Our thyratron engineering team has extensive experience supporting a wide range of applications.
- Medical
- Laser and Fast Switching
- Radar and General Purpose
- Accelerator
- Crowbar (Klystrons and Inductive Output Tube [IOT] Protection)
Product
|
High
|
Peak Anode
|
Peak Anode Current
|
Avg
|
Cathode
|
Reservoir Heater
|
Cross
|
Notes |
| L4884B | 1 | 16 | 325 | 0.2 | 6.3/11.5 | — | 8503, 5C22, 8613, CV-2520, CV6022 | 5, 9, 14 |
| L4680 | 1 | 25 | 1,000 | 1.25 | 6.3/14.5 | 6.3/7.5 | CX-1180 | 2 |
| L4904 | 1 | 35 | 1,750 | 3 | 6.3/27.0 | 5.0/9.0 | CX-1154 | 2, 4 |
| L4904A | 1 | 35 | 1,750 | 2 | 6.3/27.0 | 6.2/5.3 | TX-1154 | 2, 4 |
Notes:
- Gradient grids, one or more
- Auxiliary (pre-ionizing) grid
- Integral anode cooling chamber
- Shielded gap for x-ray attenuation
- Plug-in socket required
- MT-4 mounting socket
- Grounded grid (triggered spark gap thyratron)
- High-pulse repetition rate design
- Reservoir heater and cathode heater internally connected in parallel
- Metal-ceramic version of glass design
- Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service
- Long-grid ceramic to suppress external arc-over
- Oil for De-Qing operation
Notes: Unless otherwise indicated, these devices are flange-mounted single voltage gap triodes. Peak Current (ib) ratings can be appreciably higher for sub-microsecond pulse widths. The minimum open circuit control grid voltage and the minimum peak short circuit control grid current is specified. Cathode and reservoir heater voltages are nominal operating voltages. Cathode and reservoir heater currents are the maximum levels for the nominal voltage.
Product
|
High
|
Peak
|
Peak
|
Avg
|
Cathode
|
Reservoir Heater
|
Cross
|
| L4897A | 1 | 20 | 3000 | 6.3/8.3 | 6.3/1.75 | — | — |
| L4115 | 1 | 35 | 2,000 | 6.3/22 | 6.3/3 | — | — |
| L4189A | 1 | 35 | 20,000 | 6.3/22 | 6.3/3 | F-189, LP-189, LP289 | 11 |
| L4915B | 1 | 35 | 10,000 | 6.3/22 | 6.3/6 | HY-3003, F-211, LT-340, F-340 | 11 |
| L4961 | 1 | 35 | 12,500 | 6.3/22 | 6.3/3 | 246 | 11 |
| L4945A | 2 | 50 | 10,000 | 6.3/24 | 6.3/3.0 | F229, LS-3229, CX2608 | 1, 2, 11 |
| L4906A | 1 | 35 | 20,000 | 6.3/14.5 | 6.3/3.0 | F-205 | 7, 11 |
Notes:
- Gradient grids, one or more
- Auxiliary (pre-ionizing) grid
- Integral anode cooling chamber
- Shielded gap for x-ray attenuation
- Plug-in socket required
- MT-4 mounting socket
- Grounded grid (triggered spark gap thyratron)
- High-pulse repetition rate design
- Reservoir heater and cathode heater internally connected in parallel
- Metal-ceramic version of glass design
- Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service
- Long-grid ceramic to suppress external arc-over
- Oil for De-Qing operation
Notes: Unless otherwise indicated, these devices are flange-mounted single voltage gap triodes. Peak Current (ib) ratings can be appreciably higher for sub-microsecond pulse widths. The minimum open circuit control grid voltage and the minimum peak short circuit control grid current is specified. Cathode and reservoir heater voltages are nominal operating voltages. Cathode and reservoir heater currents are the maximum levels for the nominal voltage.
Product
|
EIA
|
App
|
Peak Anode Current
|
Peak
|
Avg
|
Cathode Heater
|
Reservoir Heater
|
Cross Reference |
Notes |
| L4669 | 7782 | MIL-PRF-1/1636 | 12 | 350 | 0.2 | 6.3/7.0 | 6.3/2.5 | HY-6, KU-71 | — |
| L4668 | 7665A | MIL-PRF-1/1485 | 16 | 350 | 0.5 | 6.3/8.0 | 6.3/4.0 | HY-60, FX2522 | — |
| L4676 | 7665 | MIL-PRF-1/1485 | 16 | 350 | 0.5 | 6.3/8.0 | 6.3/4.0 | KU-72 | — |
| L4884 | 8613 | MIL-PRF-1/1590 | 16 | 500 | 0.5 | 6.3/11.5 | — | HY-1A, FX2522 | 5, 9 |
| L4884A | — | 5389078 | 16 | 500 | 0.5 | 6.3/11.5 | — | HY-1050 | 5, 9 |
| L4958 | 7620 | MIL-PRF-1/1612 | 20 | 500 | 0.5 | 6.3/7.5 | 6.3/4.0 | HY-10N, HY-14 | — |
| L4898 | — | — | 20 | 500 | 0.5 | 6.3/7.5 | 6.3/4.0 | HY-10R, 0261, F261 | — |
| L4897 | — | — | 20 | 500 | 0.5 | 6.3/7.5 | 6.3/4.0 | HY-11T,0265/F-265, FX2541 | — |
| L4871 | 5949A | MIL-PRF-1/1100 | 25 | 500 | 1 | 6.3/22 | 4.5/6.0 | F-150,FX-2519 | 5, 10 |
| L4960 | — | — | 25 | 1,000 | 2 | 6.3/22 | 6.3/6.0 | HY-3055 | — |
| L4885 | 7322 | MIL-PRF-1/1371 | 25 | 1,000 | 2 | 6.3/22 | 6.3/6.0 | 1802 | 6 |
| L4901 | — | — | 30 | 2,000 | 2 | 6.3/25 | 4.5/10 | CX1670A,0279 | 4 |
| L4886 | 7390 | MIL-PRF-1/1361 | 33 | 2,000 | 4 | 6.3/35 | 4.5/10 | — | — |
| L4886A | — | — | 33 | 2,000 | 4 | 6.3/35 | 4.5/10 | 0281 | — |
| L4886B | 8789 | MIL-PRF-1/1658 | 33 | 2,000 | 4 | 6.3/35 | 4.5/10 | — | — |
| L4886C | 7667 | — | 35 | 2,000 | 4 | 6.3/35 | 4.5/10 | 7667, KU-274 | — |
| L4990 | 7890 | 9747588 | 40 | 2,400 | 4 | 6.3/25 | 4.5/10 | 7890 | 1, 3 |
| L4883 | 8614 | 713090-18 | 40 | 4,000 | 10.9 | 6.3/30 | 4.5/11 | HY-5 | — |
| L4883A | — | 7534252 | 40 | 4,000 | 4 | 6.3/30 | 4.5/11 | HY-5G | — |
Notes:
- Gradient grids, one or more
- Auxiliary (pre-ionizing) grid
- Integral anode cooling chamber
- Shielded gap for x-ray attenuation
- Plug-in socket required
- MT-4 mounting socket
- Grounded grid (triggered spark gap thyratron)
- High-pulse repetition rate design
- Reservoir heater and cathode heater internally connected in parallel
- Metal-ceramic version of glass design
- Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service
- Long-grid ceramic to suppress external arc-over
- Oil for De-Qing operation
Notes: Unless otherwise indicated, these devices are flange-mounted single voltage gap triodes. Peak Current (ib) ratings can be appreciably higher for sub-microsecond pulse widths. The minimum open circuit control grid voltage and the minimum peak short circuit control grid current is specified. Cathode and reservoir heater voltages are nominal operating voltages. Cathode and reservoir heater currents are the maximum levels for the nominal voltage.
Product
|
High
|
Peak Anode
|
Peak Anode Current
|
Avg
|
Cathode
|
Reservoir Heater
|
Cross
|
Notes |
| L4913 | 2 | 70 | 3,000 | 2 | 6.3/25 | 5.0/7.05 | CX1168 | 1, 2, 4 |
| L4963 | 3 | 105 | 3,000 | 2 | 6.3/25 | 5.0/7.0 | CX1171D | 1, 2, 4, 13 |
| L4938 | 1 | 35 | 15,000 | 12 | 6.3/70 | 4.5/20 | 146 | 1, 2, 4 |
| L4888 | 2 | 55 | 15,000 | 8 | 6.3/75 | 4.5/25 | 0241, 8479, F-175, CX-1836, CX-1536 | 2, 4 |
| L4174 | 1 | 33 | 2,000 | 4 | 6.3/27 | 5.5/10 | CX-1174 | 2, 4 |
Notes:
- Gradient grids, one or more
- Auxiliary (pre-ionizing) grid
- Integral anode cooling chamber
- Shielded gap for x-ray attenuation
- Plug-in socket required
- MT-4 mounting socket
- Grounded grid (triggered spark gap thyratron)
- High-pulse repetition rate design
- Reservoir heater and cathode heater internally connected in parallel
- Metal-ceramic version of glass design
- Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service
- Long-grid ceramic to suppress external arc-over
- Oil for De-Qing operation
Notes: Unless otherwise indicated, these devices are flange-mounted single voltage gap triodes. Peak Current (ib) ratings can be appreciably higher for sub-microsecond pulse widths. The minimum open circuit control grid voltage and the minimum peak short circuit control grid current is specified. Cathode and reservoir heater voltages are nominal operating voltages. Cathode and reservoir heater currents are the maximum levels for the nominal voltage.
Product
|
High
|
Anode
|
Peak Anode Current
|
Coulomb Transfer per pulse Coul. |
Cathode
|
Reservoir Heater
|
Cross
|
Notes |
| L4945A | 2 | 40 | 1,500 | 7 | 6.3/22 | 6.3/3 | CX-2708 | 1, 2, 4 |
Notes:
- Gradient grids, one or more
- Auxiliary (pre-ionizing) grid
- Integral anode cooling chamber
- Shielded gap for x-ray attenuation
- Plug-in socket required
- MT-4 mounting socket
- Grounded grid (triggered spark gap thyratron)
- High-pulse repetition rate design
- Reservoir heater and cathode heater internally connected in parallel
- Metal-ceramic version of glass design
- Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service
- Long-grid ceramic to suppress external arc-over
- Oil for De-Qing operation
Notes: Unless otherwise indicated, these devices are flange-mounted single voltage gap triodes. Peak Current (ib) ratings can be appreciably higher for sub-microsecond pulse widths. The minimum open circuit control grid voltage and the minimum peak short circuit control grid current is specified. Cathode and reservoir heater voltages are nominal operating voltages. Cathode and reservoir heater currents are the maximum levels for the nominal voltage.
