needle/cartridge alignment is the first place to look.
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I have to say channel imbalance is something that makes me crazy. You should be able to isolate imbalance to either TT or phono pre-amp - I think. Can you switch TT leads into phono pre-amp first? If it doesn't change anything try switching phono pre-amp to amp leads next. Have you checked the cartridge/stylus alignment? That would certainly explain the "vinyl only" symptoms...on the other hand if Dylan sounds balanced maybe your system is OK??? Can you listen to the recordings that seemed "imbalanced" on another system? I'll be curious what you find out if you do track down the cause.
Decapg - Please DON'T plug TT outputs into preamp OUT! What I was suggesting was a pretty obvious diagnostic that probably already occurred to you...
I assumed you had an outboard phono preamp. What I was suggesting is just reverse the left and right turntable output cables...plug left TT out into the right channel phono preamp INPUT. Plug right TT out into left preamp INPUT. If the lower volume imbalance DOESN'T move to the right channel this would implicate the preamp (or something else downstream). If it does move, it means the problem is with the TT. If you have an outboard preamp, you can try the same exercise. Reversing preamp L & R channel outputs going into amp inputs. Hope this clarifies
IME most imbalance issues, apart from weak tubes and TT set up, are due to system set up, including seating position, which is caused by unbalanced reflections, such as having the left speaker further or closer to a wall than the right speaker, or having the listening chair in a place where the reflections from one side are heard as louder due to furnishings etc.
To check out pre-amp and amp you really need a mono source. On many occasions when I have heard an imbalance I just put on a mono source and find I have a dead center image and the problem was a poor recording. On a couple of occasions I shifted my chair a couple of inches.
If none of this works, visit your friendly ENT and have him check/clean/test your ears. :-)