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1T4

Sensibly equivalent to:
1F3 CV785 DF91 VT-173 W17
See also:
1T4 Exploded - La Radiotechnique 1T4 Box
    
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The 1T4 is a miniature screened pentode for dry battery operation. It was designed for radio reception and is a variable μ RF device.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Datasheet & 1040 Type 1T4 was first introduced in 1940.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f-
a
g2
ic
f-
g1
f+

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
90
67.5
0
3.5
1.5
0.5M
0.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 04, 2013.
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