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Low Noise Preamplification Tube (12AX7 / ECC83)
Electro Harmonix offers with the 7025EH a low noise and microphone version of the 12AX7 preamplifier tube. It will prove particularly effective in the first preamplification stages of an audio system, where noise and microphony can become a real problem. The brand carries out numerous tests to ensure the correct measurements of its tubes. The 7025EH is characterized by clear and precise midrange as well as soft and balanced highs.
| 1 | Second triode plate |
| 2 | Second triode grid |
| 3 | Second triode cathode |
| 4, 5, 9 | Heater |
| 6 | First triode plate |
| 7 | First triode grid |
| 8 | First triode cathode |
| Specifications | |
|---|---|
| Product type | Preamplification tube |
| Compatibility | 12AX7 ECC83 |
| Contacts number | 9 |
| Electrical parameter | ||||
|---|---|---|---|---|
| Parameter | Condition | Min. | Nominal | Max. |
| Heater current | Filament voltage 6.3V | 325mA | 347mA | 370mA |
| Filament voltage 12.6V | 162mA | 173mA | 185mA | |
| Grid back current | Filament voltage 6.3V Plate voltage 250V Grid voltage 2V Grid resistance 1MΩ | - | - | 0.2µA |
| Plate current | Filament voltage 6.3V Plate voltage 250V Grid voltage 2V | 0.75mA | - | 2mA |
| Plate current at the beginning of the characteristics | Filament voltage 6.3V Plate voltage 250V Grid voltage 2V | - | - | ±40% |
| Amplification factor | Filament voltage 6.3V Plate voltage 250V Grid voltage 2V | 82 | - | 110 |
| Cathode-heater insulation resistance | Filament voltage 6.3V Cathode-heater voltage ±200V | 20MΩ | - | - |
| Max permissible operating conditions | ||||
|---|---|---|---|---|
| Parameter | Condition | Min. | Max. | |
| Filament voltage | Parallel connection | 6V | 6.6V | |
| Serie connection | 12V | 13.2V | ||
| Plate voltage | - | - | 300V | |
| Cathode-heater voltage | - | - | ±200V | |
| Cathode current | - | - | 10mA | |
| Power dissipation at the plate of each triode | - | - | 1W | |
| Grid circuit resistance for each of the triodes | Fixed bias | - | 1MΩ | |
| Self bias | - | 2.2MΩ | ||
| Temperature at the most heated part of the envelope | - | - | 368K | |
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