| US | European | Chinese | Russian | Premium Model |
| 6DJ8 | ECC88 | 6N23 | 6N23P | CCa |
| 6922 | E88CC | 6N11 | 6N23P-EV | - |
| 6SN7 | 6SN7 | 6N8 | 6N8P - 6CC10 | B65, 5692 |
| 6SL7 | 6SL7 | 6N9 | 6N9P | 5691, 6SU7 |
| 6267 | EF86 | 6J8 | 6J32P | Z729, EF806S |
| 5687 | 5687 | 6N12 | - | 5687WA |
| - | ECC85 | 6N1
| 6N1P | 6N1P-EV |
| 6AX7 | ECC41, (Cannot replace ECC83/12AX7) | 6N2
| 6N2P / 6SS41 | 6N2P-EV |
| 2C51/5670 | ECC42 | 6N3 | 6N3P / 6SS42 | WE396A, 6854, 6385, CV2831, 5670, 5670WA, CK5670, CK5670WA, CV2575, CV4013, CV5894, CV8247, GL5670 |
| 12AX7 | ECC83 | 6N4 |
| 5751, 4004 |
| 12AU7 | ECC82 | 6N10 |
|
|
| 6BM8 | ECL82 | - | 6F3P |
|
| 6BQ5 | EL84 | 6P14 | 6P14P | N709, E84L, 7320, 7189, 7189A |
| 6L6 | 6L6 | 6P3P | 6P3S | KT66, EL37, WE350B, VT75 |
| 6V6 | 6V6 | 6P6P | 6P6S | KT63, 5992 |
| 6550 | - | 6P27P | 6P27P | KT88 |
| 5U4G | 5U4G | 5Z3P | 5Z3S | U52, WE274A/B, 53KU |
| 5Y3 | - | 5Z2P | 5Z2S | U50 |
| 5Z4 | GZ30 | 5Z4P | 5Z4S | - |
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