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1T4

Sensibly equivalent to:
1F3 CV785 DF91 W17
See also:
1T4 Exploded - Tungsram 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.
This valve was purchased new in 1963 to build a one valve broadcast receiver. The design was by Gilbert Davey from an excellent book 'Fun With Radio'. High impedance headphones were mandatory and a pair of Brown type F were available. Many hours of clandestine Radio Luxemburg were enjoyed under the bed clothes until the Ever Ready 90 Volt HT battery died. A cheap Far Eastern transistor radio was then cheaper than a new HT battery.
The thin glass tube envelope is 19 mm in diameter and, excluding the B7G base pins, is 46 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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