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

Hanaleimike
maybe, just maybe what I did in terms of a wall mount (not grown on my own tree) could work for you too. Have a look at my system.
The tt is jolly close to the speakers going easy to 35Hz and I get no feedback to my pick-up what ever, I promise.

The idea with this is to have a sturdy mount, but VERY little in the way of low frequency 'getting a grip' so to speak on the support.

The idea came for some VERY high-end tt mounted in a system on display some time ago with Image HiFi (high-end German mag.)

The wall needs to be of course VERY solid, as it is in my case e.g. brick and mortar.

Please let me know what you think.
Axel

What table are we talking about and where do you have it currently with respect to your system pictures? Are you thinking of moving that stuffed chair and placing the table there, next to the truss?

Mike what about moving the chair to the right away from the A-frame beam and mounting the support, sandbox and TT on the beam.

Hi Dan, it is a thoren td-147, I currently have it where the c-30 is in the picture as I have upgraded my preamp, but not my systems photos. I am thinking about moving that chair to the right.
Sam, I thought about it, and it would probably be the easiest, but there are 2 ceiling fans across that beam, when I put my hand on the beam I can feel their vibrations, I don't think that would be good, but the vibrations are at a much higher frequency.
I understand there is going to be some trial and error, I am trying to minimize the number of holes I drill into the wood wall. You should see my floor.

Sorry to highjack my own thread, but this is turning into a turntable isolation thread.
Tvad, I am having a hard time finding info on ceiling hanging, is this better then a wall shelf, would I use heavy chain, and a slab of granite? poured concrete? I have moved the speaker and added 2 more isolation platforms and now I can stomp my foot close to the turntable without skipping, most of the time. I recently blew my 10" acoustic coupler voice coils on my Vandersteen 3a's, so the deep bass is not there right now, but I think it goes to about 35hz, and I am not getting any terribly noticeable feedback, but I think I could do better. I used the hi-fi new lp and my cartridge resonates at around 12 hz, so even with the couplers back in after repair, the speakers shouldn't cause an issue at 20or 25 hz. It would be nice to be able to completely isolate from the floor, and the wall is not bearing, and is underneath a 10ft window. It shakes when I bang on it.