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Tube Circuit of the Month Archive
Our archive of tube Circuits of the Month is described below.
June 99 A Common Cathode Line Stage
Here is a line stage amplifier that has a very low input capacitance and low output impedance and does not invert the phase at the output.
April 99 Auto Bias Part One & May 99 Auto Bias Part Two
Auto-bias means never having to worry about the correct current adjustment for an amplifier. As the output tubes age or are replaced with fresh new tubes, the bias current will remain constant. This month's circuits use active grid voltage adjustments to set the current bias for the output tubes.
March 99 Easy Cathode Followers
Just how little is required to make a working ground level Cathode Follower? Two resistors and a triode is the answer. One resistor to bias the grid to 0 volts and one cathode resistor is all it takes. More can be added, but at the cost of simplicity.
February 99 High Voltage Regulator
With many audio devices what is needed is a voltage regulator that can shield the audio portion of the circuit from the noise originating from the power supply and the wall receptacle, while not generating any noise of its own. This high voltage regulator is quiet enough to use with an MC pre-preamp.
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