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SP2D

 
    
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The SP2D is an RF pentode from Tungsram. It is a battery valve with a two volt filament that consumes 100 mA.
A B4 based version was released in 1938 with the B7 based version following the next year.
The control grid connects to the top cap. Within the glass the filament tension springs can be seen.
The B7 base pins.
Thanks to Mark Mallison for sending the images.
The classic envelope is  mm in diameter, and excluding the B7 base pins is  mm tall.
Reference: 1043. Type SP2D was first introduced in 1938.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.1
150
150
-0.1
1.45
0.35
2M
1.7
Updated December08, 2018.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:2.0v pins:7 pin:1.m pin:2.a pin:3.g3 pin:4.f pin:5.f pin:6.- pin:7.g2 pin:tc.g1
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