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Something like a transistor in class A amplifying mode could do what you want.
Put a capacitor on the output and you'll get negative current flow. It will be similar as if you had attached a speaker. You do not need to add a negative power supply.
It will not automatically subtract .75 V (the net equation for what you want), unless you adjust components carefully so you get the desired output range.
The above suggestion may not work for all waveforms or all frequencies.
Here is a schematic which will handle both DC signals, and slow AC waveforms. It works with the aid of two diodes, which just happen to drop .7V or so.
It does not contain a capacitor. However you must add a negative supply of a few volts.
Your signal must be able to source a milliamp or so.
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