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EF80

Sensibly equivalent to:
64SPT 6BX6 8D6 CV1376 Z152 Z719
See also:
The Construction of the EF80 - Television RF Valve Development - The Screen in an EF80 - Valves and their Habits - Valves for Bands III, IV & V - Pye B18T AC/DC Television Chassis
    
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The EF80 internally screened pentode was a workhorse of the VHF TV receiver and was introduced in 1950. It was described by Mullard as: a high slope RF pentode and not a variable μ type. The EF85 was the variable μ counterpart to the EF80. This example is marked with the reseller's branding.
The electrodes only occupy a part of the envelope, the top space is coated internally with the getter.
The thin glass tube envelope is 20 mm diameter and excluding the B9A base pins, is 58 mm tall.
References: Datasheet & 1040. Type EF80 was first introduced in 1950.

 

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
Va
Vs
Vg
mAa
mAs
ra
gm
170
170
-2
10
2.5
0.4M
7.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December23, 2013.
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