Note the 140 volts power supply requirement of the third schematic, which is the cost of eliminating the interstage coupling capacitor. But the increase in available cathode-to-plate voltage must be added to the advantage list.
   
Push-Pull
Transformer Coupled Amplifiers
   Since the music sources, portable CD players, MP3 player, and pocket FM radios, are all single-ended output devices, a phase splitter will be needed to drive a push-pull output stage, which will greatly increase the complexity and tube count of a design. Or will it? The White cathode follower and the SRPP are push-pull circuits that accept a single-ended, an unbalanced input. And even a traditional push-pull output stage with two output tubes sharing a common cathode resistor and plates terminated into the output transformer's primary, may get away without a tube phase splitter. An input transformer with a center-tapped secondary is a phase splitter. Additionally,  a phase splitter can be from as little as a two resistors! The circuit below makes the point.

    Alternatively, a tube phase splitter could be used so as to eliminating the need for a separate floating power supply per channel, the major liability of the previous circuit. (The minor liability is its halving of the input voltage.) Which phase splitter topology should we use?  The answer depends on whether more gain is needed. The split load phase splitter has the best balance, but offers no gain. The long tail phase splitter offers gain, but a poorer balance and requires a second triode. Some possible circuits are shown below.

    The secret to unraveling this circuit is the realization that the power supply for the output tubes is floating, i.e. it does not find a ground at the source's ground, but rather at the midpoint of the two resistors that span the source's output and the source's ground.