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X148

Sensibly equivalent to:
7S7
    
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The X148 (directly = to 7S7) triode heptode was designed for frequency changer use in radio receivers. The 'x' in the type designation indicates a frequency changer.
The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 54 mm tall.
References: Datasheet, 3002 & 1040. Type X148 was first introduced in 1948.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
a(t)
g1(t),g3
g2,g4
g1
k
h

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-2
1.7
2.2
2.0M
2.0

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
150
5.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 31, 2013.
shape:wide.glass.tube construction:all.glass type:triode.heptode age:1940.1950 base:b8b heater:6.3v pins:8 pin:1.h pin:2.a pin:3.a(t) pin:4.g1(t).g3 pin:5.g2.g4 pin:6.g1 pin:7.k pin:8.h
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