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W17

Sensibly equivalent to:
1F3 1T4 CV785 DF91
See also:
1T4 Exploded - Mazda Miniature Valves Advert
    
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The W17 is a miniature variable μ screened pentode for dry battery operation. It was designed for radio reception and operates at RF and IF into the low HF bands.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 45 mm tall.
References: Datasheet & 3002. Type W17 was first introduced in 1947.

 

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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