7665A
Hydrogen-Filled Ceramic Thyratron
The data to be read in conjunction with the Hydrogen
Thyratron Preamble.
DESCRIPTION
The 7665A is a rugged hydrogen thyratron designed for use in
compact military and civil radars. It has a ceramic envelope with
a mounting flange and flying lead connections.
It features low jitter and low anode delay time and is suitable for
use at high pulse repetition rates; it can switch peak powers up
to 3 MW. The tube will operate over an ambient temperature
range of 755 to +130 8C. A hydrogen reservoir is
incorporated.
This tube was designed to comply with, and is electrically
tested to, MIL-E-1/1485D.
Peak forward anode voltage ...... 16 kVmax
Peak inverse anode voltage ...... 16 kVmax
Peak anode current ........350 Amax
Average anode current .......500 mAmax
Rate of rise of anode current .... 2000 A/ms max
Anode heating factor .......5x10
9
VApps max
GENERAL
Electrical
Cathode (connected internally
to one end of heater) ........ oxide coated
Heater voltage .......... 6.3+ 7.5% V
Heater current .......... 4.5 A
Reservoir voltage ......... 6.3+ 7.5% V
Reservoir current ......... 2.0 A
Tube heating time (minimum) ..... 3.0 min
Mechanical
Seated height ......63.5 mm (2.500 inches) max
Clearance required below
mounting flange ......25.4 mm (1.000 inch) min
Overall diameter
(mounting flange) . . . 57.15 mm (2.250 inches) max
Net weight ....... 160g(0.35 pound) approx
Mounting position ............. any
Base .............flange mounting
Cooling ...........natural or forced-air
When operating at maximum anode dissipation, forced-air
cooling up to 0.14 m
3
/min (5 ft
3
/min) should be directed into
the anode cup.
PULSE MODULATOR SERVICE
MAXIMUM AND MINIMUM RATINGS
(Absolute values)
Min Max
Anode
Peak forward anode voltage
(see note 1) .........– 16 kV
Peak inverse anode voltage (see note 2) . – 16 kV
Peak anode current .......– 350 A
Average anode current ......– 500 mA
Rate of rise of anode current
(see note 3) .........– 2000 A/ms
Anode heating factor .......– 5x10
9
VApps
#e2v technologies (uk) limited 2005 A1A-7665A Issue 5, November 2005
282G/2639
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