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I think what we're trying to find out is:


...if you have the meter before the amplifier, and the amplifier is shut off BUT STILL IN LINE, how the SWR?


Then, without doing anything else, turn the amplifier ON.  Now, how's the SWR?


With a typical amplifier, if it's not turned on, the rf passes right through it; the amplifier is transparent as far as the radio is concerned.  Then, when you turn the amplifier ON, the radio sees the input circuitry which, as Captain KW pointed out, may or may not be a good thing.