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Vacuum Tube Data Sheets 12AX7 / ECC83Application notes
MICROPHONICS The tube can be used without special precautions against microphonic effect inamplifiers in which the input voltage is higher than 50 millivolts when the tube ismounted in the near vicinity of a 5 watt loud speaker with an acoustical efficiency of 5%.
HUM The hum and noise level will be better than - 60 db when the grid circuit impedance isless than 0.5 megohms (at 60 cps), the center tap of the heater is grounded and thecathode resistor is decoupled by a capacitor of at least 100 uf.
| Supply Voltage |
250 |
350 volts |
| Cathode Resistance |
1200 |
820 ohms |
| Total Current |
1.08 |
1.70 mA |
| Output Voltage6 (RMS) |
35 |
45 volts |
| Voltage Gain |
58 |
62 |
| Percent Distortion7
|
5.5 |
3.5 % |
6 Eo at grid current starting point.
7 The total harmonic distortion is approximately proportionalto the output voltage.
Vacuum Tube Data Sheets
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