Turntable Hum

Power cords themselves won't cause this except that they are the path to ground. So lifting the ground on one or both is another test. Use a cheater plug to test this. Then if that doesn't work I would try the Allnic somewhere else, another system, anything at all just to rule it out. 

Solving puzzles over the internet is a PITA because things that would be freaking obvious in person come in dribs and drabs online. Like I just noticed you said "high buzzing comes from the right side of the turntable." What are you talking about? Please be careful to discern between mechanical vibrations you hear emanating from the physical device itself and hum or other noise that is in the electrical signal and so is only heard coming from the speakers.

I'll try your suggestions, the only time the hum goes away is when the phonostage is out of the loop 🤷‍♂️

If nothing is connected to the input of the phono preamp, does it still hum? If yes, based on the statement above the problem is the phono section, which might have to be serviced.

Building on Ralph’s diagnosis— you have tubes in the Manley. Have u checked the phonostage tubes?or tubes anywhere else in the signal path.   Perhaps microphonic?  

@millercarbon thanks..when I disconnected the RCAs from TT to Allnic & inputted 1 by 1 I noticed on the right input a slightly higher pitched buzzing , nothing major , just slight...electrical , emanating from speakers for sure..I'll try moveing the allnic to anotehr system & see if its noisy....Arent these Phonostages kinda inherently noisy because they are boosting the signal so much? 

@swanny76109 The Allnic 1202 Phonostage is almost brand new...I do notice when I tap on the cylindrcal tube cases I get a fair amount of feedback through the speakers ...noisy...thanks 

Yes, inherently noisy, and this can vary a lot between cartridges and arms even on the same phono stage. Usually anything low level and uniform like you're talking would be within the norm. You can try and reduce if it matters to you but could spend an awful lot of time for very little to gain. Except when it is one channel like you said. In that case you should be able to get the noisy one down to the same level as the other- unless there is something wrong somewhere.

That is what we're trying to figure out. That is why you want to try the phono stage somewhere else. If you get the same noises, it's the Allnic. If not, keep looking. 

You picked up on the main idea, phono stages have a tremendous amount of gain. Things that would never be audible anywhere else can be unlivable with all the gain. Worth it in the end, even if it doesn't seem that way sometimes.