Left channel produces NO sound.......Help needed


I have an Ear 834p phono pre. I discovered that my left channel produces no sound. All connections are secure.When I play my cdp I get normal sound from both speakers. Could a tube have blown in the Ear unit? I have never owned tube gear prior to this phono pre. It's not but six months old and hasn't had a tremendous amount of use. Any and all suggestions would be appreciated.
zenieth
have you tried to isolate the problem by switching left/right and right/left that may reveal the source
of the problem
Dirty stylus? Loose wire in the tonearm or cartridge? See if all the tubes light up in the EAR.
Try swapping the Left and Right phono cables that go into the EAR. If the problem changes channels, then it is somewhere in the turntable rig. If the problem remains on the left channel, then it is in the EAR.
Thanks for all of your responses. I found that the cable from the tone arm to the Ear is faulty. This Rega cable isn't making a snap in connection. When I push firmly it makes a good connection. But when I let go it looses that connection. Any idea as to how to make the rca plug snap into place?