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210SPT

Sensibly equivalent to:
CV1049 SP210 SP2 SPT2 VR49 Z22
See also:
CV1049 short entry
    
Extras ▼

 

This exhibit is in wonderful condition. The top cap style shows this to be an early version. This battery RF pentode was produced in two versions, one on a B7 base and another on a B4 base.
The design application was RF amplification in broadcast radio receivers.
The picture above shows in detail the construction of the wire grids.
The further magnification demonstrates the way the grids were wound. The grid wire can be seen to be fitted into the support rod. In production the support rods were first notched by one cutting disc, the grid wire then was then wound into the notch and finally a blunt peening wheel would be used to close the metal over the grid wire and thus hold it in place.
The classic envelope is 36 mm in diameter and, excluding the B7 base pins, is 104 mm tall.
References: Datasheet & 1043. Type 210SPT was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
m
g1
g3
f
f
-
g2
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.1
150
60
-0
2.95
0.75
0.6M
1.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 03, 2015.
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