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Power Tubes |
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There are three types of power tubes, They are triodes, beam power, and pentode. The type known as beam power were originally tetrodes with a beam forming |
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electrode added. This was done by one manufacturer to get around a patent held by another. The fifth electrode added to the tube was not called a grid and |
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didn't look like a grid. It was called a beam former and the tube was called a beam tetrode. In modern day schematics, starting in the 1950s, no distinction |
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is made between a beam forming electrode and a suppressor grid. However, I have. The tubes which I call "beam tetrodes" have the beam forming structure |
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although it is shown schematically as a suppressor grid which is tied internally to the cathode. Old tube manuals and schematics will show it as a deflector |
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plate symbol. One tube has a power amplifier and a triode in the same envelope. It is listed here instead of having a page of its own. |
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Heater (H), Filament (F) |
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Single Ended |
Push-Pull |
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Tube |
Function or Configuration |
H/F |
V |
A |
Other heater voltages |
Max Plate Watts |
Max Plate V |
Max G2 V |
Gm |
Rp |
Po |
Dist. |
Po |
Dist. |
Base |
Notes |
|
1A5GT |
Power Pentode |
F |
1.4 |
50 mA |
- |
N/A |
110 |
110 |
850 |
300 k |
115 mW |
0.07 |
N/A |
N/A |
Octal |
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1E7 |
Twin Power Pentode |
F |
2.0 |
0.24 |
- |
N/A |
135 |
135 |
N/A |
N/A |
- |
- |
0.575 |
N/A |
Octal |
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2A3 |
Power Triode |
F |
2.5 |
2.5 |
- |
N/A |
300 |
- |
5250 |
800 |
3.5 |
N/A |
15 |
N/A |
4 pin |
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2A5 |
Beam Tetrode |
H |
2.5 |
1.75 |
6F6 |
11 |
375 |
285 |
2550 |
78 K |
4.8 |
0.09 |
18 |
0.05 |
6 pin |
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2E26 |
Beam Tetrode |
H |
6.3 |
0.8 |
- |
10 |
400 |
200 |
N/A |
N/A |
4 |
10.0% |
42 |
N/A |
Octal |
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3Q4 |
Beam Tetrode |
F |
2.8 CT |
50 mA |
- |
N/A |
90 |
90 |
2150 |
N/A |
270 mW |
7.0% |
N/A |
N/A |
7 pin mini |
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3Q5GT |
Beam Tetrode |
F |
2.8 CT |
50 mA |
- |
N/A |
110 |
110 |
2200 |
100 k |
400 mW |
6.0% |
N/A |
N/A |
Octal |
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3S4 |
Power Pentode |
F |
2.8 CT |
50 mA |
- |
N/A |
90 |
67.5 |
1575 |
100 k |
270 mW |
12.0% |
N/A |
N/A |
7 pin mini |
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3V4 |
Power Pentode |
F |
2.8 CT |
50 mA |
- |
N/A |
90 |
90 |
2150 |
N/A |
270 mW |
7.0% |
N/A |
N/A |
7 pin mini |
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6AG7 |
Power Pentode |
H |
6.3 |
0.65 |
- |
9 |
300 |
300 |
11000 |
130 k |
3 |
7.0% |
N/A |
N/A |
Octal |
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6AH4GT |
Power Triode |
H |
6.3 |
0.75 |
- |
7.5 |
500 |
- |
4500 |
1780 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6AQ5 |
Beam Tetrode |
H |
6.3 |
0.45 |
5, 12, 19 |
12 |
275 |
275 |
4,100 |
52 k |
4.5 |
8.0% |
10 |
5.0% |
7 pin Mimi |
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6AR5 |
Beam Tetrode |
H |
6.3 |
0.4 |
- |
8.5 |
250 |
250 |
2,300 |
68 k |
3.4 |
11.0% |
N/A |
N/A |
7 pin Mimi |
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6AS5 |
Beam Tetrode |
H |
6.3 |
0.8 |
- |
5.5 |
150 |
117 |
5,600 |
N/A |
2.2 |
10.0% |
N/A |
N/A |
7 pin Mimi |
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6AU5 |
Beam Tetrode |
H |
6.3 |
1.25 |
- |
10 |
550 |
200 |
5,600 |
6 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6AV5 |
Beam Tetrode |
H |
6.3 |
1.2 |
12, 17, 25 |
11 |
550 |
175 |
5,900 |
14.5 K |
N/A |
N/A |
N/A |
N/A |
Octal |
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6BF5 |
Beam Tetrode |
H |
6.3 |
1.2 |
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5.5 |
250 |
117 |
7,500 |
12 k |
1.9 |
10.0% |
N/A |
N/A |
7 pin Mimi |
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6BG6 |
Beam Tetrode |
H |
6.3 |
0.9 |
19 |
20 |
700 |
350 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
Octal |
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6BK5 |
Beam Tetrode |
H |
6.3 |
1.2 |
12, 25, 50 |
9 |
250 |
250 |
8,500 |
100 k |
3.5 |
7.0% |
N/A |
N/A |
7 pin Mimi |
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6BM8 / ECL82 |
Beam Tetrode (plus triode) |
H |
6.3 |
0.78 |
- |
7 |
300 |
200 |
6200 |
200 k |
3.3 |
10.0% |
10 |
4.0% |
9 pin mini |
See Pentode/Triodes page for triode ratings. |
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6BQ5/EL84 / EL844 |
Beam Tetrode |
H |
6.3 |
0.76 |
8, 10 |
12 |
300 |
300 |
10,500 |
38 k |
5.7 |
10.0% |
17 |
4.0% |
9 pin mini |
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6BQ6 |
Beam Tetrode |
H |
6.3 |
1.2 |
12, 25 |
11 |
600 |
175 |
5,500 |
20 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CA5 |
Beam Tetrode |
H |
6.3 |
1.2 |
12 17 25 50 |
5 |
130 |
130 |
8,100 |
16 k |
1.5 |
6.0% |
N/A |
N/A |
7 pin Mimi |
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6CA7 / EL34 |
Beam Tetrode |
H |
6.3 |
1.5 |
- |
25 |
800 |
425 |
11,000 |
15 k |
11 |
10.0% |
54 |
1.6% |
Octal |
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6CB5/A |
Beam Tetrode |
H |
6.3 |
2.5 |
- |
23 |
800 |
200 |
8,800 |
5000 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CD6G |
Beam Tetrode |
H |
6.3 |
2.5 |
25 |
15 |
700 |
175 |
7,700 |
7200 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CD6GA |
Beam Tetrode |
H |
6.3 |
2.5 |
25, 35 |
20 |
700 |
175 |
7,700 |
7200 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CK4 |
Power Triode |
H |
6.3 |
1.25 |
- |
12 |
550 |
- |
5,500 |
1200 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CL5 |
Power Pentode |
H |
6.3 |
2.5 |
- |
25 |
700 |
200 |
6,500 |
6000 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CL6 |
Power Pentode |
H |
6.3 |
0.65 |
- |
7.5 |
300 |
150 |
11,000 |
150 k |
2.8 |
8.0% |
N/A |
N/A |
9 pin mini |
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6CM6 |
Beam Tetrode |
H |
6.3 |
0.45 |
12 |
12 |
315 |
285 |
3,750 |
80 k |
5.5 |
12.0% |
14 |
3.5% |
9 pin mini |
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6CU5 |
Beam Tetrode |
H |
6.3 |
1.2 |
|
7 |
150 |
130 |
7,500 |
10 k |
2.3 |
10.0% |
N/A |
N/A |
7 pin Mimi |
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6CU6 |
Beam Tetrode |
H |
6.3 |
1.2 |
12, 25 |
11 |
600 |
200 |
9500 |
14.5 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6CW5 |
Beam tetrode |
H |
6.3 |
0.76 |
- |
12 |
250 |
200 |
10,000 |
23 k |
5.6 |
10.0% |
25 |
1.0% |
9 pin mini |
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6CZ5 |
Beam Tetrode |
H |
6.3 |
0.45 |
- |
12 |
350 |
285 |
4,800 |
73 k |
5.4 |
10.0% |
21.5 |
1.0% |
9 pin mini |
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6DN6 |
Beam Tetrode |
H |
6.3 |
2.5 |
25 |
15 |
700 |
175 |
9,000 |
4000 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6DQ5 |
Beam Tetrode |
H |
6.3 |
2.5 |
- |
24 |
990 |
190 |
10,500 |
5500 |
N/A |
N/A |
N/A |
N/A |
Octal |
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6DQ6B |
Beam Tetrode |
H |
6.3 |
2.5 |
12 17 25 |
18 |
770 |
220 |
7,300 |
18 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6DT5 |
Beam Tetrode |
H |
6.3 |
2.5 |
12, 25 |
9 |
315 |
285 |
6,200 |
N/A |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
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6DZ7 |
Dual pentode |
H |
6.3 |
1.52 |
- |
13.2 each |
440 |
300 |
11300 |
38 k |
3.8 |
10.0% |
18 |
2.5% |
Octal |
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6EH5 |
Beam Tetrode |
H |
6.3 |
1.2 |
12 25 50 |
5 |
135 |
117 |
14600 |
11 k |
1.4 |
7.0% |
3.8 |
5.0% |
7 pin Mimi |
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6EM5 |
Beam Tetrode |
H |
6.3 |
0.8 |
8 |
10 |
315 |
285 |
5100 |
50 k |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
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6EZ5 |
Beam Tetrode |
H |
6.3 |
0.8 |
- |
12 |
350 |
300 |
4100 |
50 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6F6/G/GT |
Beam Tetrode |
H |
6.3 |
0.7 |
2A5 |
11 |
375 |
285 |
2550 |
78 K |
4.8 |
9.0% |
18 |
5.0% |
Octal |
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6FW5 |
Beam Tetrode |
H |
6.3 |
1.2 |
- |
17.5 |
770 |
220 |
6600 |
20 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6GC5 |
Beam tetrode |
H |
6.3 |
1.2 |
- |
12 |
220 |
140 |
8,000 |
28 k |
3.8 |
10.0% |
N/A |
N/A |
9 pin mini |
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6GK6 |
Power Pentode |
H |
6.3 |
0.76 |
- |
13.2 |
330 |
330 |
11,300 |
38 k |
5.7 |
10.0% |
17 |
4.0% |
9 pin Mimi |
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6GM5 |
Beam tetrode |
H |
6.3 |
0.8 |
- |
19 |
550 |
440 |
10,200 |
29 k |
11 |
13.0% |
45 |
1.5% |
9 pin mini |
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6GT5/A |
Beam Tetrode |
H |
6.3 |
1.2 |
12 17 |
17.5 |
770 |
220 |
7,100 |
15 k |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
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6GW6 |
Beam Tetrode |
H |
6.3 |
1.2 |
12 17 |
17.5 |
770 |
220 |
7,100 |
15 k |
N/A |
N/A |
N/A |
N/A |
Octal |
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6GW8 / ECL86 |
Beam tetrode (plus triode) |
H |
6.3 |
0.66 |
Beam Tetrode |
9 |
550 |
300 |
10,000 |
48 k |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
Triode; µ = 100. |
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Triode |
0.5 |
300 |
- |
1600 |
62.5 k |
- |
- |
- |
- |
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6K6GT |
Beam Tetrode |
H |
6.3 |
0.4 |
- |
8.5 |
315 |
285 |
2,100 |
110 k |
4.5 |
15.0% |
10.5 |
6.0% |
Octal |
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6L6/G/GA |
Beam Tetrode |
H |
6.3 |
0.9 |
- |
19 |
360 |
270 |
5,200 |
35 k |
10.8 |
15.0% |
26.5 |
2.0% |
Octal |
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6L6GB |
Beam tetrode |
H |
6.3 |
0.9 |
- |
22 |
400 |
300 |
5200 |
33 k |
10.8 |
15.0% |
26.5 |
2.0% |
Octal |
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6L6GC |
Beam tetrode |
H |
6.3 |
0.9 |
- |
30 |
500 |
450 |
5200 |
33 k |
10.8 |
15.0% |
55 |
1.8% |
Octal |
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6N6/G |
Direct Coupled Power Triode |
H |
6.3 |
0.8 |
- |
N. A. |
300 |
- |
2400 |
24 k |
5.5 |
5.0% |
13.5 |
5.0% |
Octal |
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6N7/G |
Power Triode |
H |
6.3 |
0.8 |
- |
6 |
300 |
- |
3200 |
11 k |
N/A |
N/A |
10 |
8.0% |
Octal |
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6P14P-EV |
Pentode |
H |
6.3 |
0.76 |
- |
14 |
450 |
350 |
11,300 |
N/A |
N/A |
N/A |
25 |
4.0% |
9 pin mini |
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6S4/A |
Power Triode |
H |
6.3 |
0.6 |
- |
8.5 |
550 |
- |
4,500 |
3600 |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
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6V6GT/GTA |
Beam tetrode |
H |
6.3 |
0.45 |
5, 12 |
12 |
315 |
285 |
3,750 |
80 k |
5.5 |
12.0% |
14 |
3.5% |
Octal |
|
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6W6GT |
Beam Tetrode |
H |
6.3 |
1.2 |
12, 25 |
10 |
300 |
150 |
8,000 |
28 k |
3.8 |
10.0% |
N/A |
N/A |
Octal |
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6Y6G/GT |
Beam Tetrode |
H |
6.3 |
1.25 |
- |
12.5 |
200 |
135 |
7,100 |
18.3 k |
6 |
10.0% |
N/A |
N/A |
Octal |
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7C5 |
Beam Tetrode |
H |
6.3 |
0.45 |
14 |
14 |
315 |
285 |
3,750 |
80 k |
5.5 |
12.0% |
14 |
3.5% |
Loctal |
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|
10 |
Power Triode |
F |
7.5 |
1.25 |
- |
N. A. |
425 |
1600 |
9.6 |
6 k |
N/A |
N/A |
N/A |
N/A |
4 pin |
|
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12A6 |
Beam Tetrode |
H |
12.6 |
0.15 |
- |
7.5 |
250 |
250 |
3,000 |
70 k |
3.4 |
7.0% |
N/A |
N/A |
Octal |
|
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12B4/A |
Power Triode |
H |
12.6 CT |
0.3 |
- |
6 |
550 |
- |
6,300 |
1030 |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
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12BV7 |
Power Pentode |
H |
12.6 CT |
0.3 |
- |
6.25 |
300 |
175 |
13,000 |
85 k |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
|
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12BY7 |
Power Pentode |
H |
12.6 CT |
0.3 |
- |
6.5 |
300 |
180 |
11,000 |
93 k |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
|
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25A6 |
Power Pentode |
H |
25 |
0.3 |
- |
5.3 |
160 |
135 |
2,000 |
45 k |
2.2 |
N/A |
N/A |
N/A |
Octal |
|
|
31 |
Power Triode |
F |
2.0 |
0.13 |
- |
N. A. |
180 |
1050 |
3.8 |
3600 |
N/A |
N/A |
N/A |
N/A |
4 pin |
|
|
33 |
Power Pentode |
F |
2.0 |
0.26 |
- |
N. A. |
180 |
180 |
1750 |
55 k |
N/A |
N/A |
N/A |
N/A |
5 pin |
|
|
38 |
Power Pentode |
H |
6.3 |
0.3 |
- |
N. A. |
250 |
250 |
1200 |
100 k |
N/A |
N/A |
N/A |
N/A |
5 pin with top cap |
|
|
41 |
Power Pentode |
H |
6.3 |
0.4 |
- |
8.5 |
315 |
285 |
2,100 |
110 k |
4.5 |
15.0% |
10.5 |
6.0% |
6 pin |
|
|
42 |
Power Pentode |
H |
6.3 |
0.7 |
2A5 |
11 |
375 |
285 |
2550 |
78 K |
4.8 |
9.0% |
18 |
5.0% |
6 pin |
|
|
43 |
Power Pentode |
H |
25 |
0.3 |
- |
5.3 |
160 |
135 |
2,000 |
45 k |
2.2 |
N/A |
N/A |
N/A |
6 pin |
|
|
45 |
Power Triode |
F |
2.5 |
1.5 |
- |
N. A. |
250 |
2050 |
3.5 |
1700 |
N/A |
N/A |
N/A |
N/A |
4 pin |
|
|
46 |
Power Tetrode |
F |
2.5 |
1.75 |
- |
10 |
400 |
Tie to plate |
N. A. |
N. A. |
N/A |
N/A |
20 |
N/A |
5 pin |
Push-pull Triode connected 400 v plate 20 watts output with 5200 ohm plate to plate load. |
|
47 |
Power Pentode |
F |
2.5 |
1.75 |
- |
N. A. |
250 |
250 |
2500 |
60 k |
2.7 |
N/A |
N/A |
N/A |
5 pin |
|
|
48 |
Power Tetrode |
H |
30 |
0.4 |
- |
N. A. |
125 |
100 |
3900 |
N. A. |
2.5 |
N/A |
N/A |
N/A |
6 pin |
2.5 watts SE with 1500 ohm load. |
|
49 |
Power Tetrode |
F |
2.0 |
0.12 |
- |
N. A. |
135 |
Tie to plate |
1125 |
4175 |
N/A |
N/A |
3.2 |
N/A |
5 pin |
Push-pull, Grids 1 and 2 tied together, Vp = 180 v, Load = 1200 ohms, Po = 3.2 watts. |
|
50B5 |
Beam Tetrode |
Identical to 50C5 Except for pin connections. |
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50C5 |
Beam Tetrode |
H |
50 |
0.15 |
11 12 17 25 35 |
7 |
150 |
130 |
7,500 |
10 k |
2.3 |
10.0% |
N/A |
N/A |
7 pin mini |
|
|
50EH5 |
Beam Tetrode |
H |
50 |
0.1 |
6, 12, 25 |
5 |
135 |
117 |
14600 |
11 k |
1.4 |
7.0% |
3.8 |
5.0% |
7 pin Mimi |
|
|
50FA5 |
Beam Tetrode |
H |
50 |
0.1 |
- |
5.2 |
150 |
130 |
5800 |
13 k |
1.5 |
10.0% |
N/A |
N/A |
7 pin Mimi |
|
|
50FY8 |
Beam Tetrode plus Triode |
H |
50 |
0.15 |
- |
10 |
150 |
150 |
7500 |
5 k |
3 |
10.0% |
N/A |
N/A |
9 pin mini |
|
|
50L6GT |
Beam Tetrode |
H |
50 |
0.15 |
12, 25, 35 |
8.5 |
200 |
125 |
6100 |
34 k |
3 |
10.0% |
N/A |
N/A |
Octal |
Very different from the 6L6 family. |
|
53 |
High mu Duo Power Triode |
H |
2.5 |
2.0 |
- |
6 |
300 |
- |
3200 |
11 k |
N/A |
N/A |
10 |
8.0% |
7 pin |
|
|
59 |
Power Pentode |
H |
2.5 |
2.0 |
- |
11 |
250 |
250 |
2300 |
2600 |
4.8 |
9.0% |
18 |
5.0% |
7 pin |
|
|
71A |
Power Triode |
F |
5.0 |
0.25 |
- |
N. A. |
180 |
1700 |
3.0 |
1750 |
N/A |
N/A |
N/A |
N/A |
4 pin |
|
|
79 |
Power Triode |
H |
6.3 |
0.6 |
- |
11.5 |
250 |
N/A |
N/A |
N/A |
8 |
N/A |
N/A |
N/A |
6 pin |
|
|
117L7/M7GT |
Beam Tetrode plus HW Rect |
H |
117 |
90 mA |
- |
6 |
117 |
117 |
5300 |
17 k |
0.85 |
5.0% |
N/A |
N/A |
Octal |
|
|
117N6GT |
Beam Tetrode plus HW Rect |
H |
117 |
90 mA |
- |
5.5 |
117 |
117 |
7000 |
16 k |
1.2 |
6.0% |
N/A |
N/A |
Octal |
|
|
117P7GT |
Beam Tetrode plus HW Rect |
H |
117 |
90 mA |
- |
6 |
117 |
117 |
5300 |
17 k |
0.85 |
5.0% |
N/A |
N/A |
Octal |
|
|
300B |
Power Triode |
F |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
807 |
Beam Tetrode |
H |
6.3 |
0.9 |
- |
25 |
600 |
300 |
5700 |
39 k |
11.5 |
12.0% |
47.5 |
2.2% |
5 pin |
|
|
833A |
RF Power Triode |
F |
N/A |
N/A |
- |
300 |
3000 |
- |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
4 pin clamps |
|
|
5763 |
Beam Tetrode |
H |
6.3 |
0.75 |
- |
12 |
300 |
250 |
7000 |
N/A |
N/A |
N/A |
N/A |
N/A |
9 pin mini |
|
|
5881 |
Beam tetrode |
H |
6.3 |
0.9 |
- |
23 |
400 |
400 |
5,200 |
48 k |
11 |
13.0% |
26.5 |
2.0% |
Octal |
|
|
6146 |
Beam Tetrode |
H |
6.3 |
1.25 |
6159, 6883 |
25 |
600 |
250 |
N/A |
N/A |
N/A |
N/A |
82 |
8.0% |
Octal |
|
|
6550 |
Beam tetrode |
H |
6.3 |
1.6 |
- |
35 |
600 |
400 |
9000 |
27 k |
20 |
13.5% |
100 |
2.5% |
Octal |
|
|
6973 |
Beam tetrode |
H |
6.3 |
0.45 |
- |
12 |
440 |
330 |
4800 |
73 k |
N/A |
N/A |
24 |
2.0% |
9 pin mini |
|
|
7027A |
Beam tetrode |
H |
6.3 |
0.9 |
- |
35 |
600 |
500 |
6000 |
22.5 k |
N/A |
N/A |
76 |
2.0% |
Octal |
|
|
7189A |
Pentode |
H |
6.3 |
0.76 |
- |
13.2 |
440 |
330 |
11300 |
40 k |
N/A |
N/A |
24 |
4.0% |
9 pin mini |
|
|
7355 |
Beam tetrode |
H |
6.3 |
0.8 |
- |
18 |
500 |
400 |
7600 |
42 k |
9 |
15.0% |
40 |
6.0% |
Octal |
|
|
7408 |
Beam tetrode |
H |
6.3 |
0.45 |
- |
14 |
350 |
315 |
4100 |
50 k |
4.5 |
7.0% |
N/A |
N/A |
Octal |
|
|
7581A |
Beam tetrode |
H |
6.3 |
0.9 |
- |
35 |
500 |
450 |
5200 |
N/A |
N/A |
N/A |
55 |
1.8% |
Octal |
|
|
7591A |
Beam tetrode |
H |
6.3 |
0.9 |
- |
19 |
550 |
440 |
10200 |
N/A |
N/A |
N/A |
45 |
2.0% |
Octal |
|
|
7754 |
Beam tetrode |
H |
6.3 |
1.2 |
50 |
16 |
150 |
150 |
11000 |
N/A |
N/A |
N/A |
10 |
6.0% |
9 pin mini |
|
|
7695 |
Beam tetrode |
H |
50 |
0.15 |
6 |
16 |
150 |
150 |
11000 |
N/A |
N/A |
N/A |
10 |
6.0% |
9 pin mini |
|
|
7868 |
Beam tetrode |
H |
6.3 |
0.8 |
- |
19 |
550 |
440 |
10200 |
29 k |
11 |
13.0% |
44 |
5.0% |
9 pin novar |
|
|
8417 |
Beam tetrode |
H |
6.3 |
1.6 |
- |
35 |
660 |
500 |
2300 |
N/A |
N/A |
N/A |
100 |
2.5% |
Octal |
|
|
KT66 |
Beam tetrode |
H |
6.3 |
1.3 |
- |
25 |
500 |
500 |
7000 |
N/A |
7 |
9.0% |
50 |
5.0% |
Octal |
|
|
KT77 |
Beam tetrode |
H |
6.3 |
1.4 |
- |
25 |
800 |
600 |
10500 |
N/A |
N/A |
N/A |
70 |
1.5% |
Octal |
|
|
KT88 |
Beam tetrode |
H |
6.3 |
1.6 |
- |
42 |
800 |
600 |
11500 |
N/A |
N/A |
N/A |
100 |
2.5% |
Octal |
|
|
KT90 |
Beam Tetrode |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|