Thyratrons

The Williamsport operation also produces a line of metal-ceramic hydrogen Thyratrons. These devices feature peak anode voltages up to 100KV with switching currents up to 20,000 Amps. They are used as switch tubes in a wide variety of applications such as Radars, Lasers and scientific and medical Accelerators.

Medical Thyratrons
Product #	High Voltage Gaps	Peak Anode Voltage kV	Peak Anode Current A		Avg Anode Current Adc		Control Grid Drive V/A	Cathode Heater Vac/Aac	Reservoir Heater Vac/Aac	Cross Reference	Notes
L-4884B	1	16	325		0.25		200/0.4	6.3/11.5	-	8503, 5C22, 8613, CV-2520, CV-6022	5,9,14
L-4680	1	25	1000		1.25		600/1.2	6.3/14.5	6.3/6.0	CX-1180	2
L-4904	1	40	3000		3		600/1.2	6.3/22.0	5.0/4.0	CX-1154	2,4
L-4904A	1	36	2000		2		600/1.2	6.3/22.0	5.9/3	TX-1154	2,4
L-4935	2	50	2000		1.5		500/2.5	6.3/22.0	6.3/6.0	0207, F-207	1

Laser and Fast Switching Thyratrons
Prod #	High Volt Gaps	Peak Anode Voltage kV	Peak Anode Current A		Avg Anode Current Adc		Control Grid Drive V/A	Cathode Heater Vac/Aac	Reservoir Heater Vac/Aac	Cross Reference	Notes
L-4189A	1	35	20,000		0.3		500/1.25	6.3/22	6.3/3	F-189, LP-189, LP-289	11
L-4915B	1	35	7,500		0.3		500/1.25	6.3/22	6.3/3	HY-3003, F-211, LT-340, F-340	11
L-4961	1	35	10,000		0.25		500/1.25	6.3/22	6.3/3	246	11
L-4902	1	33	2,400		4		1300/1.80	6.3/25	4.5/10	0117/F-117	2
L-4903	1	33	3,000		4		1300/1.80	6.3/25	4.5/10	0194/F-194	2,3
L-4945	2	50	10,000		1		200/0.10	6.3/18	6.3/3.0	F229, LS-3229, CX2608	1,2,11
L-4906A	1	35	20,000		0.3		500/1.25	6.3/18	6.3/3	F-205	7,11

Radar & General Purpose Thyratrons
Prod #	EIA #	App Spec	Peak Anode Current kV		Peak Anode Current A	Avg Anode Current Adc		Control Grid Drive V/A	Cathode Heater Vac/Aac	Reservoir Heater Vac/Aac	Cross Reference	Notes
L-4669	7782	MIL-PRF-1/1636	12		350	0.2		175/0.06	6.3/7.0	6.3/2.5	HY-6, KU-71	-
L-4668	7665A	MIL-PRF-1/1485	16		350	0.5		200/0.20	6.3/8.0	6.3/4.0	HY-60,FX2522	-
L-4676	7665	MIL-PRF-1/1485	16		350	0.5		200/0.20	6.3/8.0	6.3/4.0	KU-72	-
L-4884	8613	MIL-PRF-1/1590	16		500	0.5		175/0.18	6.3/11.5	-	HY-1A,FX2522	5,9
L-4884A	-	5389078	16		500	0.5		175/0.18	6.3/11.5	-	HY-1050	5,9
L-4958	7620	MIL-PRF-1/1612	20		500	0.5		200/0.20	6.3/7.5	6.3/4.0	HY-1ON, HY-14	-
L-4898	-	-	20		500	0.5		175/0.18	6.3/7.5	6.3/4.0	HY-10R,0261,F261	-
L-4897	-	-	20		500	0.5		175/0.18	6.3/7.5	6.3/4.0	HY-11T,0265/F-265,FX2541	-
L-4871	5949A	MIL-PRF-1/1100	25		1000	1		500/1.25	6.3/22	4.5/5.0	F-150,FX-2519	5,10
L-4960	-	-	25		1000	2		500/1.25	6.3/22	6.3/6.0	HY-3055	-
L-4885	7322	MIL-PRF-1/1371	25		1500	2.2		450/0.56	6.3/22	6.3/6.0	1802	6
L-4901	-	-	30		2000	2		1100/7.30	6.3/25	4.5/10	CX1670A,0279	4
L-4886	7390	MIL-PRF-1/1361	33		2000	4		1100/7.30	6.3/25	4.5/10	-	-
L-4886A	-	-	35		2000	4		1100/7.30	6.3/25	4.5/10	0281	-
L-4886B	8789	MIL-PRF-1/1658	33		2000	4		1100/7.30	6.3/25	4.5/10	-	-
L-4886C	7667	-	33		2400	4		1300/9.30	6.3/25	4.5/10	7667,KU-274	-
L-4990	7890	9747588	40		2400	4		1300/260	6.3/25	4.5/10	7890	1,3
L-4883	8614	713090-18	40		5000	8		1300/6.50	6.3/30	4.5/11	HY-5	-
L-4883A	-	7534252	40		5000	8		1300/6.50	6.3/30	4.5/1	HY-5G	-

Accelerator Thyratrons
Product #	High Voltage Gaps	Peak Anode Current kV	Peak Anode Current A		Avg Anode Current Adc	Control Grid Drive V/A		Cathode Heater Vac/Aac	Reservoir Heater Vac/Aac	Cross Reference	Notes
L-4913	2	70	3,000		3	200/0.1		6.3/25	5.0/7.05	CX1168	1,2,4
L-4963	3	90	3,000		3	1000/0.1		6.3/25	5.0/7.0	CX1171D	1,2,4,13
L-4938	1	35	15,000		12	1500/7.5		6.3/70	4.5/20	146	1, 2,4
L-4888	2	50	7,500		8	1500/7.5		6.3/70	4.5/20	0241, 8479, F-175, CX-1836, CX-1536	2,4
L-4174	1	33	2,000		3	1100/7.3		6.3/30	4.5/10	CX-1174	2,4

Crowbar Thyratron (klystron and IOT protection)
Product #	High Voltage Gaps	Anode Voltage kV	Peak Anode Current A		Coulomb Transfer per pulse Coul.	Control Grid Drive V/A		Cathode Heater Vac/Aac	Reservoir Heater Vac/Aac	Cross Reference	Notes
L-4945A	2	40	1,500		7	800/0.6		6.3/22	6.3/3	CX-2708	1, 2,4

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 minumum 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.

1. Gradient grids, one or more.
2. Auxiliary (preionizing) grid.
3. Integral anode cooling chamber.
4. Shielded gap for x-ray attenuation.
5. Plug-in socket required.
6. MT-4 mounitng socket.
7. Grounded grid (triggered spark gap thyraton).
8. High pulse repetition rate design.
9. Reservoir heater and cathode heater internally connected in parallel.
10. Metal - ceramic version of glass design.
11. Ratings presuppose sub-microsecond pulse widths or single shot/crowbar service.
12. Long-grid ceramic to suppress external arc-over.
13. Oil for De-Qing operation.