![Amazon.com - JINGERL 12AX7 Electronic Tube 12AX7B Preamplifier Valve Replace Mullard-12AX7 7025 ECC83 6N4 ECC803S Audio Preamp Vacuum Tube 2PCS Amazon.com - JINGERL 12AX7 Electronic Tube 12AX7B Preamplifier Valve Replace Mullard-12AX7 7025 ECC83 6N4 ECC803S Audio Preamp Vacuum Tube 2PCS](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/51iekd-HslL._AC_UF350,350_QL50_.jpg)
Amazon.com - JINGERL 12AX7 Electronic Tube 12AX7B Preamplifier Valve Replace Mullard-12AX7 7025 ECC83 6N4 ECC803S Audio Preamp Vacuum Tube 2PCS
![Siemens 5751 Triple Mica NOS preamp tubes ( VERY RARE!) ECC83 / 12AX7 / 7025) röhre, hifi, valvola | Reverb Italia Siemens 5751 Triple Mica NOS preamp tubes ( VERY RARE!) ECC83 / 12AX7 / 7025) röhre, hifi, valvola | Reverb Italia](https://rvb-img.reverb.com/image/upload/s--cNKR-NRL--/f_auto,t_large/v1656510813/ujkx7wpkvz7sbu9hqlak.jpg)
Siemens 5751 Triple Mica NOS preamp tubes ( VERY RARE!) ECC83 / 12AX7 / 7025) röhre, hifi, valvola | Reverb Italia
Beacon Tube Amps - TWIN TRIODE GAIN FACTORS The table below gives the gain factors for various twin triode preamp tubes with the same pin-out. All of them are drop in replacements.
![Sylvania 12AX7 Short Black Plate "Square Getter" NOS preamp tube (EXTREMELY RARE!) ECC83 7025 | Reverb Italia Sylvania 12AX7 Short Black Plate "Square Getter" NOS preamp tube (EXTREMELY RARE!) ECC83 7025 | Reverb Italia](https://rvb-img.reverb.com/image/upload/s--rDuJjHbV--/f_auto,t_large/v1646945248/dllgqomzkqqnr76hfovf.jpg)
Sylvania 12AX7 Short Black Plate "Square Getter" NOS preamp tube (EXTREMELY RARE!) ECC83 7025 | Reverb Italia
![Amazon.com - JINGERL 12AX7 Electronic Tube 12AX7B Preamplifier Valve Replace Mullard-12AX7 7025 ECC83 6N4 ECC803S Audio Preamp Vacuum Tube 2PCS Amazon.com - JINGERL 12AX7 Electronic Tube 12AX7B Preamplifier Valve Replace Mullard-12AX7 7025 ECC83 6N4 ECC803S Audio Preamp Vacuum Tube 2PCS](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/41YS77sYuZL._AC_UF350,350_QL80_.jpg)