Vacuum Tube Data Sheets
12AX7 / ECC83
Application notes
MICROPHONICS
The tube can be used without special precautions against microphonic effect in
amplifiers in which the input voltage is higher than 50 millivolts when the tube is
mounted 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 is
less than 0.5 megohms (at 60 cps), the center tap of the heater is grounded and the
cathode 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 proportional
to the output voltage.
Vacuum Tube Data Sheets
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