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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: Data-sheet. Type 6F5 was first introduced in 1940. See also 1940 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
nc
a
nc
nc
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 January 08, 2022.
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