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5A/180M

Sensibly equivalent to:
436A PTT243
    
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The STC 5A/180M is an amplifier pentode with a very high slope used in telephone systems.
The mutual conductance value is 32 mA/V and therefore is very sensitive. The anode voltage is in the realm of battery operation but it was used in mains equipment.
The wide glass tube envelope is 27 mm in diameter, and excluding the B8B base pins, is 36 mm tall.
Reference: 1040.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
g2
k
g3
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.45
180
150
-1
26.0
6.0
-
32.0
Updated April 29, 2013.
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