Shuguang 12AX7B/ECC83 12AX7 vacuum tube tested by AT1000 Electronic Vacuum Tube

12AX7B Tube Socket connection:
![]() | 1. Anode Triode Number2 |
| 2. Grid Triode Number 2 | |
| 3. Cathode Triode Number 2 | |
| 4. Heater ( Triode 2) | |
| 5. Heater ( triode 1) | |
| 6. Anode Triode Number 1 | |
| 7. Grid Triode Number 1 | |
| 8. Cathode Triode Number 1 | |
| 9. Heater Center Tap |
9 pin miniature Preamp Tube 12AX7B:
1. Can replace Mullard 12AX7, Tung-Sol 12AX7, Mullard CV4004, 7025, ECC83.
2. Can be used for guitar tube amp and hifi audio tube amplifiers.


