30 ft rca run too long for a phono to preamp?

Hello Gentlemen, thank you for your responses.

Right now the stylus, when playing is approx. 20" from the side of the left Vandersteen. As I am getting a wobbling deep bass feedback as the volume get's up there, I have to assume that the tt is too close?
Please tell me if I'm wrong, and I will work on isolating from the speaker.

The floors are really springy as well, and after trying different isolation products from herbie's that I had on hand, I am thinking I have to wall mount the tt. I am reluctant to mount a wall rack in the tables current location, only to find the proximity to the speakers is still an issue. Without turning our living room upside down, The best place is 30ft away. What I am hearing is that is too long. I cannot move the preamp, it and everything else are plugged into dedicated circuits. So, upon reviewing your answers, I have 2 options. A 30 ft run, or a wall mounted turntable 20" from a speaker.......or sell it?

Thanks,
Mike

For a few hundred bucks you can have an electrician install some more dedicated outlets on the side wall farthest from your speakers. Then with an understanding wife and some rearrangement of furniture, you can move all your front end stuff, most of all including the turntable, to the far end of the room. You are better off with long runs between your preamp and amp than with long speaker wires, so IMO leave the amps nearby the speakers. Perhaps for some reason this solution is not possible, but it does suggest itself. I am not sure what is the "it" that the other guys and you are talking about selling. By all means don't give up vinyl because of this problem. You would be far better off with true balanced components in this situation, but it will be ok.

Do you have balanced equipment amp/preamp?

Hi, Marakanetz, no I do not have balanced components,

Tvad, I have moved some furniture around (in my head ) and have another option. If one chair magically disappears, I can wall mount the turntable placing it approx. 45" from each speaker. With a 30ft run now out of the question, I am left with this new wall mount option, and I obviously don't want to sell it, but maybe another turntable would be less susceptible to feedback? Is a Thorens td-147.
One last possibility, although I can't do it immediately, the side wall is a possibility, but will cost more and involve a new wall mounted tv, but if 45" is still too close, It may be my last option.

Thanks again for all your thoughts.