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CV785

Sensibly equivalent to:
1F3 1T4 DF91 W17
See also:
1T4 Exploded
    
Extras ▼

 

The CV785 is the UK Government code for the commercial 1T4 and is a miniature screened pentode for dry battery operation. It was designed for radio reception and is a variable μ RF device and would be employed as an IF amplifier in most cases.
The reverse with other markings. The filament can be seen as a single vertical thread with a spring at the top.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Data-sheet & 1040. Type CV785 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 April 08, 2021.
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