INCH-POUND
MIL-PRF-1/1757B
18 October 2002
SUPERSEDING
MIL-PRF-1/1757A(NAVY)
5 September 1997
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, NEGATIVE GRID (MICROW AVE)
TYPE 8965 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, planar, ceramic and metal.
See figure 1.
Mounting position: Any.
W eight: 2.5 ounces (71 grams) nominal.
ABSOLUTE RATINGS:
Parameter:
F
Ef 2/
Eb
epy
Ec
Ik
Ib
ib
Ic
ic
tp
Unit:
MHz
V
V dc
kV
V dc
mA dc
mA dc
a
mA dc
a
”s
----
----
40
----
----
125
-150
----
1,000
6.0 ± 5%
2,500
CW Osc or Amp:
Anode pulsed
6.0
1.5
----
3.0
----
----
----
3.5
----
6.0 ± 5%
3,000
Osc or Amp:
Grid pulsed
6.0
1.5
----
3.0
----
----
-150
----
2,500
6.0 ± 5%
3,000
Osc or Amp:
Test conditions:
----
6.0
1,000
----
Adj
----
100
----
----
----
----
ABSOLUTE RATINGS:
Parameter:
Du
Pp
Pg 3/
tk sec
TE
T (Anode shank)
Cooling
Unit:
----
W
W
(min)
șC 4/
șC 4/
4/ 5/
----
250
250
60
1.5
100
----
CW Osc or Amp:
Anode pulsed
----
250
250
60
1.5
100
0.0033
Osc or Amp:
Grid pulsed
----
250
250
60
1.5
100
0.0033
Osc or Amp:
Test conditions:
----
----
----
300
----
----
6/
1/
Formerly Y-616.
2/
The transit-time heating effect of the cathode may have to be compensated for by a reduction in the heater voltage after
dynamic operation of the tube has started. This back heating is a function of frequency, grid current, grid bias, anode
current, duty cycle, and circuit design and adjustment. There is an optimum heater voltage which will maintain the cathode
at the correct operating temperature for any particular set of operating conditions. A maximum variation of ±5 percent from
optimum is permitted. No reduction in heater voltage is required up to 500 MHz.
3/
The maximum instantaneous peak grid voltage for CW ratings shall be within the range of +30 and -400 volts; for pulse
service within the range of +250 to -750 volts.
AMSC N/A
1 of 9
FSC 5960
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