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6F5

Sensibly equivalent to:
CV1909
    
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The 6F5 is classified as a high-μ triode for voltage amplification. It was designed for resistance-capacitance coupled circuits. The 6SF5 is the same valve but the control grid is taken to a base pin not a top cap.
The Sylvania logo and name look to be overprinted on the valve. It is possible that this valve was bought from another maker and re-branded.
The top cap - not easy to make in a metal envelope.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 62 mm tall.
Reference: Datasheet. Type 6F5 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
-
a
-
-
h
k
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
200
-2
0.9
66k
1.15
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 03, 2019.
shape:thin.metal.tube construction:glass.disc type:triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.- pin:4.a pin:5.- pin:6.- pin:7.h pin:8.k pin:tc.g1
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