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In Reply to: RE: Phase Inverter Bias Voltage posted by sony6060 on January 17, 2017 at 15:17:19
Use Ohm's law. You can assume the actual bias voltage is a constant, and call it 2 extra volts across the tail resistor. IOW, make the negative rail deeper( more negative voltage) you will have to pass more current. Make it shallower( less negative ) and current through the tail resistor will drop.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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The phase splitter does not have a typical capacitor on the one grid going to ground. It is grounded directly. Due to this does not the negative 140 volts place the tube in a proper balance?
Tubes amplify the difference between the grid and the cathode and since the grid is grounded the signal must appear at the cathode in order for that section to amplify. Luckily there is an inverted signal appearing at the other tube sections cathode and in order to keep from attenuating it you need as high an impedance as possible from both cathodes to ground. The sole reason there is a - supply is to make the cathode resistor as large as possible and still be able to pass the plate current. If no negative supply is available some have had good results from using a choke or taken to the extreme a CCS can be used.
dave
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