May be tube related or not. It may also be a recording issue, I hear many early stereo and some mono recordings have left of center bias. Sometimes this is intended bias created by engineers/producers, other times poor remastering and or duplication.
What about your ears, ear wax can cause this, or maybe some other reason for loss of hearing.
What about your ears, ear wax can cause this, or maybe some other reason for loss of hearing.