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CV784

Sensibly equivalent to:
1FD9 1S5 DAF91 ZD17
    
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The CV784 is a diode pentode valve that was designed for battery portable radio receivers and is identical to the commercial 1S5.
The filament leaves the top mica and then passes through a small flag-like piece of metal. This is the single diode.
The diode end on has a small separation between the sides.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Data-sheet & 1040. Type CV784 was first introduced in 1947.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f-
nc
a(d)
g2
a
g1
f+

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
67.5
67.5
0
1.6
0.4
0.6M
0.63
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 27, 2021.
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