INCH-POUND
MIL-PRF-1/776F
1 December 2005
SUPERSEDING
MIL-PRF-1/776E
7 July 1999
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, POWER
TYPE 4D21
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.
See figure 1.
Mounting position: Vertical, base down or up.
Weight: 6.5 ounces (184 grams) nominal.
ABSOLUTE RATINGS: C Telegraphy.
Parameter:
F1
Ef
Eb
Ec1
Ec2
Ib
Pg1
Pg2
Pp
Cooling
T(seal)
TE
°C
°C
Unit:
MHz
V ac
V dc
V dc
V dc
mA dc
W
W
W
---
Maximum:
110
5.25
3,000
-500
400
225
5
20
125
---
200
225
Minimum:
---
4.76
---
---
---
---
---
---
---
---
---
---
---
---
1/
Test conditions:
---
5.0
2,500
Adj
500
50
---
---
---
See footnotes at end of table I.
________________________________________________________________________________________________
GENERAL:
Qualification: Required.
AMSC N/A
FSC 5960
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