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DF97

Sensibly equivalent to:
1AN5
    
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The DF97 was the last in the line of Mullard's low consumption dry battery amplifier pentodes.
At this time the Mullard production had moved offshore.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet, 1040 & 3002. Type DF97 was first introduced in 1954.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f-,s
a
g2
g3
f-,s
g1
f+

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.025
85
62
0
1.7
0.7
0.45M
0.94
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 15, 2013.
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