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A further disadvantage to this circuit is the fact that we have swapped potentially large current swings at the output for a lower input impedance. In other words, this variation should not be used to drive following low input impedance sources. (Imagine driving a dead short. What would be the output current swings into this load?) |
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The easy work around is to add a cathode follower to the output. This would free up the mixer from having to drive low impedance loads. The 20k resistor that spans ground to B+ is there to balance the entire circuit's current draw in relation to both power supply rails. |
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White cathode follower inspired mixer design with a cathode follower output stage |
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Pg.
26