INCH-POUND
MIL-PRF-1/1037E
11 March 1998
SUPERSEDING
MIL-E-1/1037D
16 February 1973
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, NEGATIVE GRID (MICROWAVE)
TYPE 6897
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.
Weight: 2 ounces nominal.
ABSOLUTE RATINGS:
Parameter:
F1
Ef
Eb
eb
Ebb
Ec
Ik
Ib
Ic
Pp
Unit:
GHz
V 1/
V dc
v
V dc
V dc
mA dc
mA dc
mA dc
W 3/
Maximum:
CW osc or amp
2.5
6.3 H 5%
1,000
----
----
-150
125
----
50
100
Anode mod
2.5
6.3 H 5%
----
1,200 2/
----
-150
100
----
50
100 4/
CW osc or amp
Test condition:
----
6.3
----
----
600
Adj
----
75
----
----
Cooling
Barometric pressure, reduced
Parameter:
Pg
tk
TE
T (anode shank)
Unit:
GC 6/
GC (see note e of figure 1)
----
mmHg
W 5/
sec (min)
Maximum:
CW osc or amp
2
60
200
200
----
30
Anode mod
----
2
60
200
200
30
CW osc or amp
Test condition:
----
300
----
----
7/
----
4/
1/
The transit-time heating effect of the cathode shall be compensated for by a reduction in heater voltage after dynamic operation of
the tube has started. The 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 a particular set of operating conditions. A maximum variation of H5 percent from optimum is permitted. No reduction in heater
voltage is required up to and including 500 MHz.
AMSC N/A
1 of 11
FSC 5960
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