INCH-POUND
MIL-PRF-1/1225F
27 July 2010
_
SUPERSEDING
MIL-PRF-1/1225E
2 July 2004
PERFORMANCE SPECIFICATION SHEET
ELECTRON TUBE, RECEIVING
TYPE 6688
This specification is approved for use by all Departments
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:
Pentode, miniature, rf, sharp cutoff.
Outline
--- 6-1 (EIA)
Base
--- E9-1
Envelope --- T6-1/2
Cathode --- Coated unipotential
Base connections:
Pin No.
1
2
3
4
5
6
7
8
9
Element
k
g1
k
h
h
int
a
g3
g2
con
ABSOLUTE RATINGS:
Parameter:
Ef
Eb
Ec1
Ec2
Ec3
Ehk
ec1
Unit:
V
V dc
V dc
V dc
V dc
v
v
Maximum:
6.6
210
0
175
0
60
---
Minimum:
6.0
---
-50
---
---
---
-100
Test conditions:
6.3
190
+9
160
0
0
---
ABSOLUTE RATINGS:
Parameter:
Rk
Rg1
Ik
Pp
Pg2
TE
Alt
MegΩ
°C
Unit:
Ohms
mA dc
W
W
ft
+155
0.6
2.7
25
0.1
---
Maximum:
1/
---
---
---
---
---
---
Minimum:
---
Test conditions:
630
---
---
---
---
---
See footnotes at end of table I.
GENERAL: Qualification Not required.
AMSC N/A
FSC 5960
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