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Параметры и характеристики .
MADE IN RUSSIA
ELECTRON VALVE 7025/12AX7WA, 7025/12AX7WB
1. GENERAL
Type 7025/12AX7WA, 7025/12AX7WB miniature double triode
with separate indirectly heated cathodes
is intended for being employed as phase inverter
or as double amplifier with resistive feedback.
Mass no more than 15 g.
Lead diagram Electrode-to-lead connection diagram
| Lead designation | Function of electrode |
| 1 | First triode plate |
| 2 | First triode grid |
| 3 | First triode cathode |
| 4, 5 and 9 | Filament |
| 6 | Second triode plate |
| 7 | Second triode grid |
| 8 | Second triode cathode |
2. OPERATING CONDITIONS
| Sinusoidal vibrations: | |
| frequency range, Hz | 1 – 200 |
| acceleration amplitude, rn/S2 | 50 |
| Mechanical impact: | |
| multiple-action impact peak impact acceleration, m/S2 | 150 |
| Elevated ambient temperature, OK: | |
| working temperature | 343 |
| limiting temperature | 383 |
| Lowered ambient temperature, OK: | |
| working temperature | 228 |
| limiting temperature | 213 |
| Temperature range, OK: | |
| from elevated ambient working temperature | 343 |
| to lowered ambient limiting temperature | 213 |
| Elevated relative humidity, %: | |
| at 308OK for climatic condition all-climatic | 98 |
| at 298 OK for climatic condition temperature-cold | 98 |
| Lowered atmospheric pressure, kPa: | |
| working pressure | 70 |
| limiting pressure | 19.4 |
| Mould fungi (for climatic condition all-climatic) |
| Parameters, conditions and units | Norm | |||||
| 7025/12AX7WA | 7025/12AX7WB | |||||
| min | Nominal | max | min | Nominal | max | |
| Grid back current, mkA (at: filament voltage 6,3 V, anode voltage 250 V, grid voltage minus 1,5 V, resistance in grid circuit, 1,0 M Ω ) | - | - | 0.2 | - | - | 0.2 |
| Slope of characteristic, mA/V (at: filament voltage 6,3 V, anode voltage 250 V, grid voltage minus 1,5 V) | 1.6 | 2.1 | 2.65 | 1.4 | 1.9 | 2.45 |
| Plate current, mA (at: filament voltage 6,3 V, anode voltage 250 V, grid voltage minus 1,5 V) | 1.4 | - | - | 1.2 | - | - |
| Filament current, mA (at: filament voltage 6,3 V) | 305 | 340 | 375 | 305 | 340 | 375 |
| Plate current at the beginning of the characteristic, mkA, (at: filament voltage 6,3 V, anode voltage 250 V, grid voltage minus 5,5 V) | - | - | 10 | - | - | 10 |
| Cathode-filament leakage current, mkA (at: filament voltage 6,3 V, cathode-filament voltage ±250 V) | - | - | 15 | - | - | 15 |
| Input capacitance, pF | 1.8 | 2.15 | 2.5 | 1.8 | 2.15 | 2.5 |
| Transfer capacitance, pF | - | 0.55 | 0.8 | - | 0.55 | 0.8 |
| Output capacitance, pF | 1.3 | 1.9 | 2.5 | 1.3 | 1.9 | 2.5 |
| First triode plate-second triode plate capacitance, pF | - | - | 0.4 | - | - | 0.4 |
| Amplification factor (at: filament voltage 6,3 V, anode voltage 250 V, grid voltage minus 1,5 V) | 85 | 91 | 97 | 95 | 102 | 110 |
| Noise voltage in a range 20 Hz—10 kHz, mkV (at: filament voltage 6,3 V, anode voltage 250 V, grid circuit resistance O MΩ, anode circuit resistance 100 kΩ, cathode circuit resistance 2700 Ω) | - | - | 300 | - | - | 300 |
3.2. Maximum permissible operating conditions
| Parameters, units | Norm | |
| min | max | |
| Filament voltage, V: | ||
| for parallel connection | 6.0 | 6.6 |
| for series connection | 12.0 | 13.2 |
| Plate voltage, V | 300 | |
| Cathode-filament voltage, V | ±100 | |
| Cathode current, mA | 10 | |
| Power dissipation at the plate of each triode, W | — | 1.0 |
| Grid circuit resistance for each of the triodes, MΩ | — | 1.0 |
| Temperature at the most heated part of the envelope, OK | — | 368 |
4. OPERATING INSTRUCTIONS
Make sure that more than one of the above maximum permissible operating conditions
are in no way attained simultaneously while the electron valve is in service.
5. STORAGE The electron valve must be kept in the manufacturer's cartons
in heated or air conditioned stores within the temperature range from 278 to 313 OK and relative humidity 80% at 298 OK.
Valves in tropical design in manufacturer's package should allow transport and storage
at relative humidity 98% and temperature 308 OK.
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