▼ Menu

1F3

Sensibly equivalent to:
1T4 CV785 DF91 W17
See also:
1T4 Exploded
    
Extras ▼

 

The 1F3 / 1T4 is a miniature screened pentode for dry battery operation. It was designed for radio reception and is a variable μ RF device.
Inside the screen can be seen the bright anode, suppressor grid and single strand filament with the support spring at the top.
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 1F3 was first introduced in 1948.

 

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 May 23, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:1.4v pins:7 pin:1.f- pin:2.a pin:3.g2 pin:4.ic pin:5.f- pin:6.g1 pin:7.f+
Return to Main Index