Good small/single outlet power conditioner for preamp.

Hi erik. All components are into the Puritan. But now with this new and very nice preamp I’m demoing, there is hum when a source is plugged into the pre. Take the pre straight to the same outlet the Puritan is plugged into and no hum. It’s a weird one, as this conditioner has never done this with other preamp or anything. 
 

I’ll look at Furman but I had a a 15i or 20i Pro years back that I thought sounded ‘mechanical’ in the end. 

@erik_squires No, not on this deadicated circuit. Just the system: a CD transport and its LTA ps, an AppleTV, an IFi spidif Purifier, DAC, pre and amp. 

@erik_squires nope. Dang it, I had some hope with that one… 

Anyone know which power conditioner is considered the competitor to the Puritan 156?? I guess I could always try that one… but I’d have to commit to this preamp first and then pray that it is compatible with the new conditioner. 

@gramophone_canada No, there is no noise when just pre and power are connected. Noise comes as soon as a DAC (two, tube or ss here to try) is connected.
I am using RCA from pre to power (and DAC to pre).
I did use a cheater plug on the DAC and it fixed the issue BUT a cheater plug is not ideal in this system. I could hear it’s affects (maybe I just need to let it settle), it added a harsh-brightness. And a cheater plug was not necessary on the DAC before this. I don’t know if it works the same with cheater plug on the pre, though.

Id actually like to not have to buy a second small filter and would rather have one that everything works with. I’ve never had hum in this system before with anything until now.

Today I am going to try the whole system on a Furutech tp609 passive power strip to see if it’s hum free. If so, I’ll dismantle the HT/TV power setup and try the Equi=Core 1800 balanced power conditioner with everything.

@psf4972 thanks for the suggestion. I looked at it but it appears to be UK based only…

wish I could edit thread title to reflect my change of heart on having two conditioners. One for all OR better yet, fixing this issue with no other purchase needed. 
 

@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. 

@elliottbnewcombjr yes, the Preamp maker has been very helpful, guiding me through lots of these checks. 

Update: The Furutech tp-609 passive power distribution unit AND the Equi=Core 1800 balanced power conditioner are BOTH hum free!!

This confirms some sort of mismatch in power or grounding between the Puritan PSM156 and the Backert Labs Rhythm 1.4 preamp. 
 

So if I elect to keep the preamp, I will need to invest in another power conditioner for the main system here… maybe a new thread for that… Unless anyone has a good recommendation for something at least relatively close to the $2300 price of the Puritan, but some more $$ is fine to consider. The Puritan is so good at its price, I’m worried what it’ll take to match its performance.