This list was expanded from
a list here (thanks
to Jim Cross!). The Bold listings are shown as equivalents
in a tube manual, and could probably be sustituted without any changes
other than rewiring (but check dissipation rating for power tubes!).
The others range from close to somewhat similar... best to compare data
sheets before trying.
| 4-5-6-7 Pin | Top Cap OCTAL | Single-Ended Octal | LOKTAL | Miniature 7 pin | Min. 9 pin | Notes |
| 1A4, 34 | 1D5G | remote cutoff | ||||
| 1A6 | 1D7G | |||||
| 1B4, 32, 951 | 1E5G | |||||
| 1B5 | 1H6G | |||||
| 1C6 | 1C7G | |||||
| 1F4, 33, 950 |
1F5G, 1G5, 1J5 | |||||
| 1F6 | 1F7G | |||||
| 19 | 1J6 | 3B7, 3C6 | 3A5 | 19, 1J6:: 2.0V fil. | ||
| 30 | 1H4G | |||||
| 1A5GT, 1Q5, 1C5 | 1LA4, 1LB4 | 1S4 | ||||
| 1A7 | 1LA6, 1LC6 |
1L6 | ||||
| 1LD5 | 1S5, 1U5 | |||||
| 1E4G | 1LE3, 1LF3 | 1C3 | ||||
| 1H5GT | 1LH4 | |||||
| 1N5 | 1LN5, 1LC5 | 1L4, 1U4 | ||||
| 1P5 | 1LG5 | 1T4 | remote cutoff | |||
| 3Q5 | 3LF4, 3D6, 3LE4 | 3Q4, 3V4, 3S4 | ||||
| 41 | 6K6G | 7B5 | 6AR5 | |||
| 42 | 6F6G | 2A5: 2.5V heater | ||||
| 43 | 25A6G | |||||
| 75 | 6B6, 6Q7 | 6SQ7 | 7B6 | 6AV6, 6BK6, 6AT6 | 6BN8 | 2A6: 2.5V htr. mu: 70-100 |
| 76, 37 | 6P5G | 27, 56: 2.5V heater | ||||
| 24, 36, 77, 6C6 | 6J7G | 6SJ7, 6SH7 | 7C7 | 6AU6 | 6BX6 | 57: 2.5V heater |
| 35, 39, 51, 78, 6D6 | 6K7, 6U7G | 6SK7 | 7A7 | 6BA6, 6BD6 | 6BY7 | 58: 2.5V htr. remote cutoff |
| 79 | 6Y7G | |||||
| 80 | 5Y3G, 5Y4G | 5AZ4 | ||||
| 83V | 5V4G, 5AR4 | indirect heating | ||||
| 84/6Z4 | 6X5 | 7Y4 | 6X4 | 6V4 | ||
| 6AX5 | 7Z4 | 6CA4, 6BW4 | ||||
| 85 | 6V7G, 6R7 | 6SR7, 6SW7 | 7E6 | 6BF6, 6CU6 | 6BJ8 | 55: 2.5V htr. mu 16-20 |
| 5Z3 | 5U4G, 5X4G | 5BC3 Novar | ||||
| 6A3 | 6B4G | 2A3: 2.5V fil. | ||||
| 807 | 6BG6 | 6L6 | 1619, 1624: 2.5V fil. | |||
| 6A6, 6E6 | 6N7 | 53: 2.5V htr. | ||||
| 6A7 | 6A8G | 7B8 | 2A7: 2.5V htr. | |||
| 6B5 | 6N6G | |||||
| 6B7 | 6B8G | 6SF7 | 7E7 | 6CR6 | 6EQ7 | 6SF7, 6CR6: 1 diode |
| 6H6 | 7A6 | 6AL5 | 6JU8 | 7A6: 150 mA htr., 6JU8: 4 diodes | ||
| 6F7 | 6P7G | |||||
| 6AG7 | 7AD7 | 6CL6, 12BY7 | ||||
| 6AQ7 | 7K7 | 6CN7, 6FM8 | ||||
| 6G6G | 6AK6 | 150 mA heater | ||||
| 6C5, 6J5, 6L5 | 7A4, XXL | 6C4 | 12AU7: (6C4 x 2) | 6C4, 6L5: 150 mA htr. | ||
| 6SA7 | 7Q7 | 6BE6 | ||||
| 6SB7 | 6BA7 | hi transconductance | ||||
| 6SG7,
6SD7 |
7H7,
7T7 |
6HR6 | 6EH7 | hi transconductance, remote cutoff | ||
| 6SE7 | 7L7 | |||||
| 6S7 | 6SS7 | 7B7 | 6BJ6 | 150 mA heater, rem cutoff | ||
| 6S8 | 6T8, 6AK8 | |||||
| 6K5, 6F5 | 6SF5 | 7B4 | 6AQ4, 6DR4 |
12AX7 | mu=100 6AQ4, 6DR4: single triode |
|
| 6C8 | 6SL7GT | 7F7 | 5751, 5755 | mu=70 (6C8: 40) | ||
| 7F8, 14F8 | 6AB4 | 12AT7, 6AQ8, 6DT8 |
6AB4: single triode | |||
| 6F8 | 6SN7GT,
6AH7 |
7N7, 7AF7 | 6CG7, 12BH7, 6GU7 |
mu=16-20 | ||
| 6J8 | 7A8 | 6AJ8 | ||||
| 6T7 | 6SZ7 | 7C6 | 6AQ6 | 150 mA heater | ||
| 6V6 | 7C5 | 6AQ5, 6HG5 | 6CM6, 6CZ5, 6061, 6BW6 | |||
| 6U6, 6W6 | 7A5 | 6AS5, 6BF5 | 6DS5, 6BK5 | |||
| 6W7 | 7C7 | 6BH6 | 150 mA heater | |||
| 12A8GT | 14B8 | |||||
| 12A6 | 14A5 | 150 mA heater | ||||
| 12H6 | 12AL5 | |||||
| 12SA7 | 14Q7 | 12BE6 | 12BA7 | |||
| 12J7 | 12SJ7 | 14C7 | 12AU6 | 6BX6 | ||
| 12K7 | 12SK7 | 14A7 12B7 | 12BA6, 12BD6 | |||
| 12SL7GT | 14F7 | 5751, 5755 | mu=70 | |||
| 12SN7GT, 12AH7 | 14N7, 14AF7 | 12BH7, 12FQ7, 12AU7 | mu=16-20 | |||
| 14Y4 | 12X4 | 12BW4 | ||||
| 12V6 | 14C5 | 12AQ5 | 12AB5, 7061 | |||
| 25B5 | 25N6G | |||||
| 25L6 | 25C5 | 25BK5 | ||||
| 25Z5 | 25Z6G | |||||
| 35L6 | 35A5 | 35B5, 35C5 | ||||
| 35Z4GT | 35Z3 | |||||
| 35Z5GT | 35Y4 | 35W4 | ||||
| 50L6 | 50A5 | 50B5, 50C5 | ||||
| 50Y6 | 50X6 | 50DC4 | 50DC4: single diode | |||
| 117Z4GT | 117Z3 | |||||
| 2050 | 2D21 | |||||
| 7591 | 6GM5 | and 7868 Novar | ||||
| 6Y6 | 6GC5, 7754 | |||||
| 50C6 | 7965 | |||||
| 6EM7, 6EA7, 6GL7 |
6FD7, 6DR7 | 6GF7 Novar, 6FM7 Compactron |
||||
| 6DN7 | 6DE7, 6EW7 | |||||
| 717A | 6AK5 |