CB Radio interference

The person using CB is overcranking (illegally) their unit.
Not much you can do to them. But for yourself:
Move the interconnectes a little. place some metal over them, and ground it to the AC wall ground.
(Cheapest version is cut a tin can so you have two half cylinders. drill a hole in each part, stich wire on each, get a wall plug and wire to only the ground pin. Plug in wall. Place half cylinders over wires..
Move them around when CB is playing.. see if it can stop the input.
The can halves would be a stopgap solution which might work.
If it does, then that would be all you need.
If it does not. then the problem may be in the phono box.

Trying to isolate the parts from airborn RFI.. Some part of the pre phono output is picking up the info.. Wires, metal parts. cart..
So you want to block the RFI from getting into the parts.
Metal is the best. a copper screen can work too. (also want to ground it)

I had CD radio coming it when i had rear surround wires lined up on wall. When I changed them to a diferent location.. it went away. It was startling! Suddenly this loud crap over my stereo!

I had the same problem about 20 years ago.The offending party lived about a block away.Fortunately he died.I still say I had nothing to do with that.You could check phono stage tubes to see if they are microphonic.I use 6dj8 which tend towards that problem.

Now you know why the rents are cheaper in Brooklyn. What kind of building do you live in? Is it pre war?

These can be tough issues to trouble shoot. The above posters offer some
good suggestions. Sometimes you gotta move (...yeah I know)

One question...is the phono stage next to a window? That may
"leak" RFI more so than a wall...

You might try something like this...several vendors have versions of this:

http://www.newark.com/ferrishield/sf005pcn-ca/emi-rfi-shielding-fabric-
82db/dp/02M1762

I just googled rfi shielding ... here's a rfi tent ;)

http://www.fine-silver-productsnet.com/70te24inx24i.html

Yes a metal cage of conducting metal such as copper for example shouldf help block the unwanted signal. The cage is called a Farraday cage, I think.