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DF66

Sensibly equivalent to:
CV2107
    
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The DF66 is a sub miniature audio amplifier pentode. The design was specifically for hearing aid use where the HT would be supplied by a 22.5 volt battery.
The red paint spot identifies the position pf wire 1.
The anode is 8 mm long and the grids can be seen through the hole in the side of the rounded anode.
The thin glass tube envelope is 8 x 5.5 mm in, and excluding the base wires is 25 mm tall.
Reference: Datasheet. Type DF66 was first introduced in 1951.

 

Pin Connections
1
2
3
4
5
a
g2
f+
g1
f-,g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
0.625
0.015
22.5
22.5
-1.05
50μ
15μ
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 13, 2013.
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