• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Resistive PI

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mashaffer

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tubiespad.angelfire.com/index.html
I am sure I am missing something but why isn't phase splitting at the input as simple as this? Is it because of needing to reference a ground between the source device and the amp?
 

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PRR

PRR

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_IF_ your source truly floats, NO reference to common, then yes, that works dandy.

Truly floating sources are e-z in SPICE but rare(*) in Real Electronics. In your plan, the source is probably a tube, or a (single-ended) tone/volume network. A transformer is a fair approximation of a floating source, but good windings cost money, and windings which push imperfections and unbalances outside the audio range are hard to impossible.

(*) Oh, one now-common source of Balanced (not Floating) signals is the push-pull output of a DAC. But that's perhaps too obvious.
 
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