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But if ground potential DC coupling is desired, a voltage doubler can be added to the power supply to feed the phase splitter a higher positive rail voltage than the output stage so that its grid can be pulled up to ground level.
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Conclusion
Is this the end of possible design changes to last month's circuit? No, of course not. Countless twists are possible. One idea that may have crossed your mind is why not use pentodes in the output stage? Early on, this idea was tried, as the pentode offered high gain and high plate dissipation. The results looked great on the scope, until a capacitive load was used; it seems that triodes are the best way to go. After some feedback from our readers, we continue with some new ideas.
//JRB
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