7665A Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – Hydrogen-Filled Ceramic Thyratron

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 kV max
Peak inverse anode voltage . . . . . . 16 kV max
Peak anode current . . . . . . . . 350
A max
Average anode current . . . . . . . 500 mA max
Rate of rise of anode current . . . . 2000 A/ms max
Anode heating factor . . . . . . . 5 x 10⁹ 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 . . . . . . . 160 g (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 m³/min (5 ft³/min) should be directed into
the anode cup.
PULSE MODULATOR SERVICE
MAXIMUM AND MINIMUM RATINGS
(Absolute values)
Anode
Min Max
Peak forward anode voltage
(see note 1) . . . . . . . . . –
Peak inverse anode voltage (see note 2) . –
Peak anode current . . . . . . . –
Average anode current . . . . . . –
Rate of rise of anode current
(see note 3) . . . . . . . . . –
Anode heating factor . . . . . . . –
16
kV
16
kV
350
A
500 mA
2000 A/ms
5 x 10⁹ VApps
e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU, UK Telephone: [phone] Facsimile: [phone]
e-mail: [e-mail] Internet: www.e2v.com Holding Company: e2v technologies plc
e2v technologies inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY10523-1482 USA Telephone: [phone] Facsimile: [phone]
e-mail: [e-mail]
# e2v technologies (uk) limited 2005
A1A-7665A Issue 5, November 2005
282G/2639