paulgardner
You've received a lot of good advice yet still have an imbalance problem .
Do you hear an imbalance with mono records ?
Do your classical symphony records have the correct orientation ?
Dealing with this problem for some time ? What did you change when it started ?
First have you switched everything left and right one by one !
from phono cables to speaker cables to left and right tubes .
Do you use a good magnifying glass when setting up your cartridge alignment ?
Do you have any old equipment , cables or tubes to switch in and out ?
Good Luck .