INCH-POUND
MIL-PRF-1/1221D
2 July 2004
SUPERSEDING
MIL-PRF-1/1221C
2 July 1999
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, RECEIVING
TYPE 6939
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:
Twin power pentode, miniature, neutralized, rf amplifier, F1 = 500 MHz.
Outline
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6-3 (EIA)
Base
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E9-1
Envelope
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T6-1/2
Cathode
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Coated unipotential
Base connections:
Pin No.
1
2
3
4
5
6
7
8
9
Element
2g1
k, g3
1g1
h
h
2a
g2
1a
hct
ABSOLUTE RATINGS:
Parameter:
Ef
Eb
Ec1
Ec2
Ehk
Ib/a
Ic1/g
Unit:
V
V dc
V dc
V dc
v
mA dc
mA dc
Maximum:
Class C, telep: (intermittent)
6.9 or 13.9
200
-50
200
100
40
4
Class C, telep: (continuous)
6.9 or 13.9
200
-50
200
100
32
3
Class C, teleg: (intermittent)
6.9 or 13.9
250
-50
200
100
50
4
Class C, teleg: (continuous)
6.9 or 13.9
250
-50
200
100
45
3
Minimum:
5.7 or 11.3
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Test conditions:
6.3 or 12.6
150
-3
150
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ABSOLUTE RATINGS:
Parameter:
Pg1/g
Pg2
Pp/a
Pi/a
TE
Alt
Unit:
W
W
W
W
ft
°C
Maximum:
1/
Class C, telep: (intermittent)
0.12
2x1.15
2.5
5.0
225
1/
Class C, telep: (continuous)
0.1
2x1.0
2.0
4.0
225
1/
Class C, teleg: (intermittent)
0.12
2x1.75
3.75
7.0
225
1/
Class C, teleg: (continuous)
0.1
2x1.5
3.0
6.0
225
Minimum:
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Test conditions:
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See footnotes at end of table I.
GENERAL: Qualification - Not required.
AMSC N/A
FSC 5960
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
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