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5A/170K

Sensibly equivalent to:
6688 CV3998 E180F EF861 PTT216
    
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The 5A/170K is a special quality high-slope RF beam tetrode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment. STC stands for Standard Telephones and Cables.
It can be seen that in this miniature envelope is an even smaller valve, this very small size helps to reduce inter electrode capacitances and thereby raises the maximum usable frequency that the device can operate at.
These valves would be used up to the UHF region of the spectrum. In telephone systems a single carries has a large number of separate telephone calls modulated upon it
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 33 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
k
g1
k
h
h
k
a
g3,s
g2

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
190
160
-1
13
3.3
35K
16.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 26, 2013.
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