Push-Pull Amplifiers
    The same logic concerning placement of the network applies to push-pull amplifier as it did to SE amplifiers: inside the feedback loop, preferably between the first and second stage. Two examples are provided below.

Observations
     Extreme care must be taken not to reverse the feedback leads or the output transformer leads, as any of these can result in positive feedback , which means the amplifier will no longer be an amplifier, but an oscillator. 

pg. 8

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