Interesting! (re: the voltage gain). I didn't realize a conditioner could do this, however my new PLC (Tice Powerblock IIIC high-power version) actually DOES indicate a higher voltage (the meters say ~124 right now, whereas my older inferior PLC indicated 117-118 most times, with the odd increase to 120).
I am sure the Hydra is good. I have found a lowered noise floor and increased 'presence' to the sound with the recent addition of the Tice PLC. This is after I plugged my amp into it (their is a special high-current area for power amps that is a separate circuit). Previous to the Tice, I had not found improvement to the sound using power amps hooked into PLC's.