Good small/single outlet power conditioner for preamp.

Anyone know what’s out there? 
I am demoing a very nice preamp but it, for currently an unknown reason, does not play well with my Puritan PSM156 conditioner. The pre exhibits noise/hum from the speakers with any source ICs plugged into it. 
But the preamp straight to the wall is hum free and all is fine. 
If I wanted to keep this pre, straight to the wall is not ideal. So I am preliminarily curious what nice small/single outlet power conditioners are out there for me to consider… 



Our power spikes alot sometimes 5x a wk.i have good luck with furman although I've tried many and have many even the old monster 2000 plus 7000 huge transformers. I need it for my expensive amps I don't like loosing sound quality but if it saves me big $$$ on audio equipment it's a compromise I'll live with.have not found one to get rid of small ground loop but they all advertise they do.

It's the preamp. you changed 1 thing, problem started.

Preamp straight into the wall, no problem, thus the preamp is good, EXCEPT it is making .....?

I would get a length of wire for a new ground somewhere: start touching contacts, this one, that one: searching for some combo that ends the hum.

I did that on my new equalizer which hummed even in bypass mode, found connecting the left and right channel's grounds to each other solved the problem. Just hit or miss.

@elliottbnewcombjr Im not qualified/knowledgeable enough to do that. If I knew more to what you’re referring to, maybe so… but that sounds iffy for me. 

Maybe the new/different/unconventional design of the Puritan filtering system does not jive with the different/special design of the GreenForce power supply in this preamp. 

Take a look at the Audience AR2P conditioner - it has surge protection and does a nice job cleaning up the AC.  Should solve the problem with the preamp.