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Screened RF tetrode
Introduced in 1929 (B4+sc, B5),
1930 (S4VA and S4VB)
1 |
2 |
3 |
4 |
5/sc |
tc |
base |
g2 |
f |
f |
g1 |
k |
a |
B4/B5 |
|
Vf |
Af |
Va |
Vs |
Vg |
mAa |
mAs |
ra |
gm |
S4V |
4 |
1 |
200 |
75 |
-1 |
1.5 |
|
910,000 |
1.1 |
S4VA |
4 |
1 |
200 |
110 |
-1.5 |
2.5 |
0.6 |
500,000 |
2 |
S4VB |
4 |
1 |
200 |
110 |
-1.5 |
4.6 |
1.05 |
300,000 |
2.5 |
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