INCH-POUND
MIL-PRF-1/1767D
16 December 2002
SUPERSEDING
MIL-PRF-1/1767C
18 July 1997
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, POWER
TYPE 8281
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:
Tetrode, ceramic-metal.
See figure 1.
Mounting position: Vertical, base down or up.
Weight: 12.8 pounds (5.8 kg) nominal.
ABSOLUTE RATINGS:
Parameter:
Ef
Eb
Ec2
Ec1
Ib
Pg1
Pg2
Pp
Anode core
Cooling
& seal T
Unit:
V ac
kV dc
kV dc
kV dc
A dc
W
W
kW
°C
1/
Maximum:
---
250
15
450
200
5
-1.5
2
10
6.3 ± 5%
C Teleg:
---
250
10
450
200
4
-1.5
1.5
8
6.3 ± 5%
C Telep:
(anode mod)
---
250
15
450
200
6
---
2
10
6.3 ± 5%
Class AB:
Test condition
6.3
2
0.75
Adj
1
---
---
---
---
2/
1/ Minimum airflow requirements for incoming air at 50°C maximum at sea level, for operation under 30 MHz, are shown.
Additional cooling may be required for operation above 30 MHz. In all cases of operation a socket which provides for forced-air
cooling of the base must be used, such as the EIMAC SK-300A, or equivalent, used with the EIMAC SK-316 Air Chimney, or
equivalent, with air flowing in a base-to-anode direction. Where long life and consistent performance are factors, cooling in
excess of minimum requirements is normally beneficial. Cooling air should be applied before or simultaneously with the
application of electrode voltages, including the filament, and should normally be maintained for a short period after all voltages
are removed to allow for tube cool-down. The cooling data shown is for the tube in a SK-300A socket with an SK-316 Air
Chimney.
Sea level
10,000 feet
Anode dissipation
Air flow
Approximate pressure drop
Air flow
Approximate pressure drop
(cfm)
(In. H2O)
(cfm)
(In. H2O)
0.4
220
7,500 W
0.6
320
2.5
555
12,500 W
3.6
810
1,130
5.0
775
15,000 W
7.3
2/ In all electrical tests involving application of filament voltage an air-system socket and chimney may be used and forced-air
cooling is allowable
GENERAL:
Qualification - Required.
AMSC N/A
1 of 6
FSC 5960
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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