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6AF4A

Sensibly equivalent to:
6DZ4 CV5074
    
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The 6AF4A was designed for TV service as a UHF oscillator in front-end mixers. Typical frequency of operation would be 0.95 GHz.
The alternative Type designation of 6DZ4 is also on the glass. As well as the printed lettering the type is also etched into the glass.
The Sylvania logo and Made in USA.
The tiny triode looks lost in the 18 mm width of the envelope.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 36 mm tall.
Reference: Data-sheet. Type 6AF4A was first introduced in 1954.

 

Pin Connections
B7G
1
2
3
4
5
6
7
a
g1
h
h
k
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.225
80
-2.4
16.0
2,270
6.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 17, 2021.
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