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Tetrodes |
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These are not beam tetrodes but tubes that actually have only 2 grids. The list would be short but for the tubes that can operate with 12 volts on their plates. |
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These tubes were designed for use in car radios that did not require a vibrator to produce 200 volts or so from a 12 volt battery. There are two types of these |
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12 volt tubes, space charge and those designated as "LV" (low voltage). In a space charge tube grid 1 has 12 volts applied to it and the signal is injected |
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at grid 2. A low voltage tetrode is biased in the normal way for a tetrode with 12 volts on grid 2 and the signal applied to grid 1. |
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Some of these have diodes or triodes in the same envelope. There are so few of these that making a separate chart would be pointless. |
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Heater (H), Filament (F) |
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Type |
Function or configuration |
H/F |
V |
A |
Other heater voltages |
Max Plate Watts |
Max Plate Volts |
Max Screen Volts |
Gm |
Rp |
Base Type |
Notes |
|
1D5GT |
Remote Cutoff Tetrode |
F |
2.0 |
60 mA |
- |
N. A. |
180 |
67.5 |
750 |
1.0 M |
Octal |
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6C9 |
VHF Duo Tetrode |
H |
6.3 |
0.4 |
17 |
2.5 Both Plates |
250 |
125 |
8000 |
100 k |
10 pin mini |
Tube has a standard 9 pin mini base but with pin 10 in the middle. Some sockets have a rivet in the center which with a little enlargement will except the 10th pin. |
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6CL8 |
Semi-remote Cutoff Tetrode Plus Triode |
H |
6.3 |
0.45 |
5, 9, 19 |
2.8 |
300 |
150 |
5800 |
100 k |
9 pin mini |
Triode mu = 40, Rp = 5 k, has separate cathode. |
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6CQ8 |
Sharp Cutoff VHF Tetrode Plus Triode |
H |
6.3 |
0.45 |
5 |
3.2 |
330 |
165 |
5800 |
140 k |
9 pin mini |
Triode mu = 40, Rp = 5 k, has separate cathode. |
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6CY5 |
VHF Tetrode |
H |
6.3 |
0.2 |
2, 3, 4 |
2.0 |
180 |
90 |
8000 |
100 k |
7 pin mini |
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6EA5 |
VHF Tetrode |
H |
6.3 |
0.2 |
2, 3 |
3.25 |
250 |
150 |
8000 |
150 k |
7 pin mini |
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6EV5 |
VHF Tetrode |
H |
6.3 |
0.2 |
2, 3 |
3.25 |
275 |
150 |
8800 |
150 k |
7 pin mini |
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12AL8 |
Space Charge Tetrode plus Triode |
H |
12.6 |
0.55 |
- |
N. A. |
30 |
16 G1 |
15000 |
480 |
9 pin mini |
Triode mu = 13, Rp = 13 k, has separate cathode. |
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12DK7 |
LV Tetrode plus 2 Diodes |
H |
12.6 |
0.5 |
- |
0.5 |
30 |
30 |
5000 |
4000 |
9 pin mini |
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12DL8 |
Space Charge Tetrode plus 2 Diodes |
H |
12.6 |
0.55 |
- |
N. A. |
30 |
16 G1 |
15000 |
480 |
9 pin mini |
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12DS7 |
Space Charge Tetrode plus 2 Diodes |
H |
12.6 |
0.4 |
- |
N. A. |
16 |
16 G1 |
16000 |
500 |
9 pin mini |
Diodes and Tetrode have common cathode. |
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12DU7 |
LV Tetrode plus 2 Diodes |
H |
12.6 |
0.25 |
- |
N. A. |
16 |
16 |
6200 |
6000 |
9 pin mini |
Diodes and Tetrode have common cathode. |
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12DV8 |
Space Charge Tetrode plus 2 Diodes |
H |
12.6 |
0.375 |
- |
N. A. |
16 |
16 G1 |
8500 |
900 |
9 pin mini |
Two diodes have common cathode. Tetrode has separate cathode |
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12DY8 |
LV Tetrode plus Triode |
H |
12.6 |
0.35 |
Tetrode |
N. A. |
16 |
16 |
6000 |
5 k |
9 pin mini |
Separate cathodes. |
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Triode |
N. A. |
16 |
- |
2000 |
10 k |
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12EM6 |
LV Tetrode plus Diode |
H |
12.6 |
0.5 |
- |
0.5 |
30 |
30 |
5000 |
4000 |
9 pin mini |
Common cathode. |
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12J8 |
LV Tetrode plus 2 Diodes |
H |
12.6 |
0.325 |
- |
N. A. |
30 |
30 |
5500 |
6000 |
9 pin mini |
Two diodes have common cathode. Tetrode has separate cathode |
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12K5 |
Space Charge Tetrode |
H |
12.6 |
0.4 |
- |
N. A. |
30 |
16 |
15000 |
480 |
7 pin mini |
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24A |
sharp cutoff Tetrode |
H |
2.5 |
1.25 |
- |
N. A. |
275 |
90 |
1050 |
600 k |
5 pin |
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32 |
Sharp cutoff Tetrode |
F |
2.0 |
60 mA |
- |
N. A. |
180 |
N. A. |
650 |
1 M |
4 pin |
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35-51 |
Remote cutoff Tetrode |
H |
2.5 |
1.75 |
- |
N. A. |
275 |
90 |
1050 |
N. A. |
5 pin |
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36 |
sharp cutoff Tetrode |
H |
6.3 |
0.3 |
- |
N. A. |
250 |
90 |
1080 |
550 k |
5 pin |
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