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6F26

Sensibly equivalent to:
6BY7 EF85 W719
See also:
Valves and their Habits
    
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The 6F26 is a VHF varible-mu pentode where the stage gain is controlled by the negative bias applied to the control grid. At the time this design was developed television receivers operated on Band I at about 50 MHz and from 1955 also on Band III at around 175 MHz. The EF183, released in the 1960s, overtook its performance.
When Band IV and Band V UHF television entered service in the early to mid 1960's the front end required specialised triodes to operate at 400 - 850 MHz.
The reverse side of the circular anode and the made in England by a BVA member.
The compound pins with the red section having the same expansion co-efficient as the hard glass used for the base.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 59 mm tall.
Reference: Datasheet. Type 6F26 was first introduced in 1960.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
k
g1
k
h
h
s
a
g2
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-2.0
10.0
2.5
0.5M
6.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2014.
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