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S4VB

Sensibly equivalent to:
CV1677
See also:
The SG Valve
    
Extras ▼

 

The S4VB is an early indirectly heated RF tetrode. For internal details refer to type S4VB.
The S4VA and S4VB specimens are typical of earlier Mullard oxide-process AC mains types (early to mid 1930s). The unsprayed S4VA has a less sophisticated form of assembly than the S23 and still relies on hand assembly using glass bead insulators. The internal skirt connected to the screen grid is a prominent feature of the design.
The reverse of the envelope is plain metallic paint.
The top of the envelope showing the Bakelite top cap skirt. The screw-on cap itself has been lost over time. The move to the top hat style of top cap happened around 1933-4.
The balloon envelope is 48 mm in diameter and, excluding the B5 base pins, is 121 mm tall.
References: 1931 datasheet & 1043. Type S4VB was first introduced in 1930.

 

Pin Connections
B5
1
2
3
4
5
tc
g2
g1
h
h
k
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.0
200
110
-1.5
4.6
1.2
0.3M
2.5
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated October 21, 2016.
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