hooked up TT and preamp to receiver sound fades out after 4-5 seconds

Thank’s for the recommendation swampwalker.

Seems like you have an issue with the set-up of the AVR.  I would do a hard re-set and work from scratch.

Well I set it up again like I did before and same thing. So I just started turning things on in different orders and it turned something on. I am getting sound now and it stays on. The only problem is it only comes from the rear 2 speakers and not the 2 front and center speakers. But at least I have sound and less hair. Thanks for all your suggestions which were all correct user error I guess or just luck. Thank goodness because this TT was almost going to have to grow wings to survive. Enjoy you day.

Try removing the headshell, checking to be sure there is no dirt or grim built up inside the connector, (on both the tonearm and the headshell itself), then reinstall it. Check to be sure the stylus assembly is firmly mounted into the cartridge body. Might not be all the way in and is causing a disconnect.

Also, try to start the cartridge a few tracks inside the LP. You might have a break in the tonearm wires that starts almost right at the beginning of the record.

Is there another system you could try the turntable out on?  We need to eliminate each piece, a piece at a time to see where the problem is.

Yes thank you mofimadness. I did all that you said at the beginning. I tried phono first , than changed it to line. The same result. Than I went to cd and did the same thing, same results. That is why I am pulling my hair out. That is when I posted here and walked away from it for the day before I end up with a flying TT. Thank you for your responses. I will start over and try again sometime today.

@mofimadness That's what makes this board great. Amidst the sturm und drang and other noise, these thoughtful, methodical solutions and thoughts still surface.

From the manual.  This might be why your TT  didn't work plugged into the phono input the first time, (before you got the outboard phono stage).

  PHONO/LINE Setup • Default setting: PHONO You can choose whether you want to use the PHONO jack on the rear of the receiver to connect a turntable, or a line level component (such as a CD or DVD player).

1 Select ‘PHONO/LINE Setup’ from the System Setup menu. The current setting is highlighted in the display.

 2 Select either PHONO or LINE.

 • PHONO – High level setting for turntables (without a built-in equalizer or pre-amplifier)
 • LINE – Line level setting for all audio components other than a turntable (except those with a built-in phono equalizer

 3 When you’re finished, select ‘Exit’. You will return to the System Setup menu.

The OP states that he tried hooking it up to the CD input, but the same thing happens.

I looked at that receiver.  My lord does that have a bunch of crap on it.  Most AV receivers need to be set up right from the beginning to work with non surround/video sources.

IMHO, there is something in the receiver's vast menu, not set up correctly.

Exactly! noromance is correct, once you purchased a external phono pre amp you need to use one of the normal line level inputs like...CD or AUX or Tuner or just about any input will work as long as its not the internal phono. 

Connect the phono amp output into a different input on the receiver.