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Duo Identical Triodes |
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The popular 12A_7 series of tubes are not the only duo identical triodes in the world. |
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Dissimilar duo triodes are on a separate page to make them easier to find. |
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Heater (H), Filament (F) |
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Type |
Function or Configuration |
H/F |
V |
A |
Other heater voltages |
Plate Dissipation (Watts) |
Max Plate Voltage |
Gm |
µ |
Rp |
Base |
Notes |
|
6AQ8 / ECC85 |
VHF Duo Triode |
H |
6.3 |
0.435 |
- |
2.5 |
300 |
6000 |
58 |
9700 |
9 Pin Mini |
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6AS7G |
Duo Power Triode |
H |
6.3 |
2.5 |
- |
13 |
250 |
7140 |
2 |
280 |
Octal |
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6BC8 |
Duo Triode |
H |
6.3 |
0.4 |
4 |
2.0 |
250 |
6200 |
35 |
5.6 k |
9 Pin Mini |
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6BK7 |
RF Duo Triode |
H |
6.3 |
0.45 |
5 |
2.7 |
300 |
9300 |
43 |
4600 |
9 Pin Mini |
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6BL7 |
Duo Triode |
H |
6.3 |
1.5 |
- |
12 Each Plate |
250 |
7000 |
15 |
2150 |
Octal |
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6BQ7 |
Duo Triode |
H |
6.3 |
0.4 |
4, 5 |
2.0 |
250 |
6400 |
38 |
5900 |
9 Pin Mini |
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6BS8 |
VHF Duo Triode |
H |
6.3 |
0.4 |
- |
2.0 |
150 |
7200 |
36 |
5.0 k |
9 Pin Mini |
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6BX7GT |
Duo Triode |
H |
6.3 |
1.5 |
- |
One Plate 12, Both Plates 10 |
250 |
7600 |
10 |
1300 |
Octal |
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6BZ7 |
VHF Duo Triode |
H |
6.3 |
0.4 |
4, 5 |
2.0 |
250 |
6800 |
36 |
5300 |
9 Pin Mini |
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6BZ8 |
Semi-Remote Cutoff duo Triode |
H |
6.3 |
0.4 |
4 |
2.2 |
250 |
8000 |
45 |
5600 |
9 Pin Mini |
Used as cascode RF amplifier in TV tuners |
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6CW7 / ECC84 |
Medium-Mu Twin Triode |
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6CG7 |
Medium mu Duo Triode |
H |
6.3 |
0.6 |
8 |
One Plate 5, Both Plates 7.5 |
450 |
2600 |
20 |
7700 |
9 Pin Mini |
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6DJ8 / 6922 / ECC88 |
VHF Duo Triode |
H |
6.3 |
0.365 |
7 |
1.8 |
130 |
12500 |
33 |
2600 |
9 Pin Mini |
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6DT8 |
VHF Duo Triode |
H |
6.3 |
0.3 |
12 |
2.5 |
300 |
5500 |
60 |
10900 |
9 Pin Mini |
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6ES8 |
VHF Duo Triode |
H |
6.3 |
0.365 |
4, 5 |
1.8 |
130 |
12500 |
34 |
2700 |
9 Pin Mini |
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6EU7 |
Audio Amplifier Phase inverter |
H |
6.3 |
0.30 |
- |
1.2 |
330 |
1250 |
100 |
80 k |
9 Pin Mini |
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6EV7 |
Duo Triode |
H |
6.3 |
0.6 |
- |
2.5 |
300 |
5200 |
60 |
11500 |
9 Pin Mini |
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6EZ8 |
Triple Triode |
H |
6.3 |
0.45 |
- |
2.0 one plate, 5.0 all three. |
330 |
4200 |
57 |
13.6 k |
9 Pin Mini |
Cathodes 1 and 2 tied to one side of heater. |
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6FQ7 |
Duo Triode |
H |
6.3 |
0.6 |
8 |
4.0 one plate, 5.7 both plates |
330 |
3000 |
20 |
6700 |
9 Pin Mini |
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6GM8 / ECC86 |
Medium-Mu Twin Triode |
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6GY8 |
Triple Triode |
H |
6.3 |
0.45 |
- |
2.0 one plate, 5.0 all three. |
330 |
4500 |
63 |
14 k |
9 Pin Mini |
Grid 1 and Cathode 3 tied to one side of heater. |
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6J6 |
Duo Triode |
H |
6.3V |
0.45A |
- |
1.5 |
300 |
5300 |
38 |
7.1K |
7 Pin Mini |
Common Cathode |
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6N6G |
Direct Coupled Power Triode |
H |
6.3 |
0.8 |
- |
N. A. |
300 |
2400 |
58 |
24 k |
Octal |
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6N7/GT |
Duo Power Triode |
H |
6.3V |
0.8A |
- |
5.5 |
300V |
3200 |
35 |
11.0K |
Octal |
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6SC7 |
Duo Triode |
H |
6.3 |
0.3 |
12 |
N. A. |
250 |
1325 |
70 |
53 k |
Octal |
Common Cathode |
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6SL7 |
Duo Triode |
H |
6.3 |
0.3 |
12 |
1.0 |
250 |
1600 |
70 |
44 k |
Octal |
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6SN7 |
Duo Triode |
H |
6.3 |
0.6 |
8, 12 |
5.0 one plate, 7.5 Both plates. |
450 |
2600 |
20 |
7700 |
Octal |
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7F7 |
High mu Duo Triode |
H |
6.3 |
0.3 |
14 |
1.0 |
250 |
1600 |
70 |
44 k |
Loctal |
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7F8 |
Duo Triode |
H |
6.3 |
0.6 |
14 |
2.5 Per Section |
300 |
2600 |
20 |
7700 |
Loctal |
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7N7 |
Medium mu Duo Triode |
H |
6.3 |
0.6 |
14 |
2.5 Per Section |
300 |
2600 |
20 |
7700 |
Loctal |
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12AD7 |
High mu Duo Triode |
H |
12.6 CT |
0.225 |
- |
1.0 |
300 |
1600 |
100 |
62500 |
9 Pin Mini |
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12AT7 / ECC81 |
Duo Triode |
H |
12.6 CT |
0.15 |
- |
2.5 |
300 |
5500 |
60 |
10.9 k |
9 Pin Mini |
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12AU7 / ECC82 |
Duo Triode |
H |
12.6 CT |
0.15 |
7, 9 |
2.75 one plate, 5.5 both plates |
300 |
2200 |
17 |
7.7 k |
9 Pin Mini |
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12AV7 |
Duo Triode |
H |
12.6 CT |
0.225 |
- |
2.7 Per Section |
300 |
8500 |
41 |
4.8 k |
9 Pin Mini |
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12AX7 / 7025 / ECC83 |
Duo Triode |
H |
12.6 CT |
0.15 |
6 |
1.0 |
300 |
1600 |
100 |
62.5 k |
9 Pin Mini |
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12AY7 / 6072 |
Duo Triode |
H |
12.6 CT |
0.15 |
- |
1.5 |
300 |
1750 |
40 |
22.9 k |
9 Pin Mini |
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12AZ7 |
Duo Triode |
H |
12.6 CT |
0.225 |
- |
2.5 |
300 |
5500 |
60 |
10.9 k |
9 Pin Mini |
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12BH7 |
Duo Triode |
H |
12.6 CT |
0.3 |
- |
3.5 Per Section |
300 |
3100 |
16.5 |
5300 |
9 Pin Mini |
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12FQ8 |
Twin Double Plate Triode |
H |
12.6 |
0.15 |
- |
0.5 |
330 |
1250 |
95 |
76 k |
9 pin mini |
Two triodes each with two plates. Could be used as a balanced modulator. Common Cathode. |
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12U7 |
LV Duo Triode |
H |
12.6 CT |
0.15 |
- |
N. A. |
30 |
1600 |
20 |
12.5 k |
9 Pin Mini |
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19 |
High mu Duo Power Triode |
F |
2.0 |
0.26 |
- |
N. A. |
135 |
N.A. |
N.A. |
N.A. |
6 pin |
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53 |
High mu Duo Power Triode |
H |
2.5 |
2.0 |
- |
5.5 |
300V |
3200 |
35 |
11.0K |
7 pin |
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79 |
Power Triode |
H |
6.3 |
0.6 |
- |
11.5 |
250 |
N/A |
N/A |
N/A |
6 pin |
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5751 |
High mu Duo Triode |
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6922 / E89CC |
High Frequency duo Triode |
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