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S410

Sensibly equivalent to:
CV1159 NR23 PM14
See also:
Marconi S215 S410 & S610 Valve Advert
    
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The S410 is a tetrode or screen grid valve that dates from 1929. It is a directly heated battery valve. In this exhibit the screw top cap anode connection is missing.
The anode is formed from two plates and is hung from the top cap connection and supported at the other end with a glass insulating bead and struts connected to the circular base screen.
The basic geometry with the screen being an all enclosing box with mesh sides.
The Osram brand label and view of the mesh.
A closer view of the screen grid with the woven mesh. The getter holder is at the base of the image.
Looking up from the pinch into the base of the screen. The first strand of the control grid can be seen. At the bottom left of the picture can be seen part of one side of the feint etched identification lozenge.
Enhanced the A and N of England can be seen. With this as the clue as to where the identification was located and knowing the format used by M-OV at the time, it took over 30 minutes to find more of the Type. First a 4 was seen, then an S above and to the right of the 4. Finally a 1 was just made out to the right of the 4.
The thin sheet nickel of the anode is given stability by the depression pressed into it.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 109 mm tall.
References: Data-sheet, & 1043. Type S410 was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
tc
g1
g2
f
f
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
μ
4.0
0.1
150
80
-1.0
4.0
-
0.2M
180
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 16, 2021.
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