INCH-POUND
MIL-PRF-1/1100G
25 February 2005
SUPERSEDING
MIL-PRF-1/1100E
19 December 2002
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, THYRATRON
TYPES 5949A AND 5949A-1
This specification is approved for use by all Depart-
ments and Agencies of the Department of Defense.
The requirements for acquiring the electron tube described herein
shall consist of this document and the latest issue of MIL-PRF-1.
DESCRIPTION: Triode, hydrogen
See figures 1, and 2.
Mounting position: Any
Weight: 2.25 pounds (1.0 kg) nominal
RATINGS:
Parameter:
Ef
epy
epx
Ebb
Ip
egy
egx
Ecc
ib
Units:
V ac
kv
kv
Kv dc
A ac
v
v
V dc
a
Maximum:
6.6
25.0 1/
25.0 2/
---
15
---
450
---
500
Minimum:
6.0
10.0
5% epy
5.0
---
3/
---
---
---
Test conditions:
6.3
25.0
---
---
---
450
---
0
---
Parameter:
Ib
prr
tj
pb
tk
TA
dik/dt
Eres
Ires
µs
°C
a/µs
Units:
A dc
V ac
A ac
6.25 x 109
Maximum:
0.5
---
0.005 4/
---
+75
2,500
5.5 5/
6.0
Minimum:
---
---
3/
---
300
-55
---
3.0
---
Test conditions:
---
500
---
---
300
---
---
6/
---
1/ Instantaneous starting is not recommended. When it is absolutely necessary, however, the maximum permissible
epy is 18.0 kv and shall not be attained in less than 0.04 seconds.
2/ The peak inverse voltage, exclusive of a spike of 0.05 µs maximum duration, shall not exceed 5 kv during the first
25 µs following the anode pulse.
3/ The driver pulse, measured at the tube socket with thyratron grid disconnected, shall be: egy = 550 volts
minimum, 1,000 volts maximum; tr = 0.25 µs maximum; tp = 2.0 µs minimum; impedance of driver circuit 50 to
200 ohms.
4/ Appreciably less jitter than 0.005 µs can be realized if anode voltage of 18 kv or more, maximum rated grid drive
voltage and a grid impedance near the lower limit are used.
5/ The optimum reservoir voltage for operation in accordance with operation (1) conditions is inscribed on the base of
the tube and must be held to within ±5 percent.
6/ Adjust reservoir voltage to value indicated on tube to within ±5 percent.
_________________________________________________________
GENERAL: Qualification - Required
AMSC N/A
1 of 6
FSC 5960
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