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1F5G

Sensibly equivalent to:
1F5 KL35
    
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The 1F5G is a battery audio output valve. It is identical electrically to the 1F4, the difference being that the 1F4 is on a UX5 base.
The anode load for use in single ended circuits is 16,000 Ohms. A cathode resistor value is not given.
The classic envelope is 43 mm in diameter and, excluding the IO base pins, is 96 mm tall.
References: Datasheet & 1043. Type 1F5G was first introduced in 1936.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
f+
a
g2
g1
-
f-
-

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
2.0
0.12
135
135
-4.5
8.0
2.4
0.2M
1.7
0.31
5%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2013.
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