|
|
|
|
HL4 |
All purpose triode |
1935 |
B5 |
HL4+ |
low microphony triode |
1936 |
B5 |
HL4G |
low capacity triode |
1936 |
B7 |
HL4GS |
as HL4G with P base |
1939 |
P |
|
|
|
|
1 |
2 |
3 |
4 |
5 |
base |
f |
g |
f |
a |
k,s |
B5 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
tc |
base |
s |
- |
- |
f |
f |
k |
a |
g |
B7 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
tc |
base |
s |
f |
f |
k |
- |
- |
- |
a |
g |
P |
|
Vf |
Af |
Va |
Vg |
mAa |
Ra |
gm |
HL4 |
4 |
1 |
200 |
-3 |
4 |
11,500 |
3.5 |
HL4+,HL4G/GS |
4 |
0.65 |
250 |
-4.5 |
5 |
11,000 |
3.5 |
|
|
|