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Originally Posted by AdrianH
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I was expecting to see some form of proper 180 phase splitter driving the finals, so not sure if these are in ClassA or AB. Thanks for the reading material I will look at all that definitely.
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That method is called various things like self inverting push pull (SIPP) or self splitting push pull (SSPP). The grid of the lower valve(s) is grounded and the full swing of the signal is applied to the upper grid. It has to operate in class A.
Have a look for Oddwatt or Poddwatt to get some ideas of operation?