EAR 834P Preamp right channel issue

So, not exactly sure what the problem was, but things are good again! 

All I did was disconnect the EAR, open it up, pulled one of the tubes, put it back, reconnected reversing L/R output and both channels were back! Disconnected again to replace EAR cover, reconnected with L/R output correct, and all good - Listening to some classic Metallica as a test!

I have no idea if there is any relationship between the two, but I had the left channel die on my Musical Fidelity M6si integrated and it was an output relay contact that needed to be replaced.

Hope you can figure things out.

Good idea on reversing cables! No, not sure that there is not a tube for L/R channels, but from the schematics I found online it was not obvious - yes, it has 3 tubes. Ya, I thought that it could also be cartridge or cable. Started by checking amp using digital source, which was fine, so problem is upstream. Running a VPI Scout turntable with 10" JMW Memorial tonearm and an AMG Teatro MC cartridge (have a Transfiguration Axia as well). The EAR feeds into a Line Magnetic 211 integrated amp.

I will try reversing L/R channel cables from EAR to IA, and from phono to EAR. That should isolate the component.

Reverse the left and right channel and see if left channel cuts out. Are you sure that there is not a tube for the right and left channel? That EAR has 3 tubes! BTW, the problem might not be the Ear. It could be anything like a bad tone arm cable or your phono cartridge!!