orpheus10
Just a little while ago, I recorded "Trance Mission" ... During recording, the music sounded louder in the left channel; that's normal for my room, not good, but normal.It sounds like your tape deck is somehow misaligned or not properly calibrated. It works out well in your installation because of its unusual room acoustics, but those tapes aren't likely to sound good using headphones, or when played back in a more neutral acoustic environment.
On playback, all was straightened out; the holographic sound stage was spread evenly across the rear wall.
Let me explain this; the louder left channel is because of the room acoustics, it has nothing to do with electronics; the very strong signal from the reel, straightened all that out, it overcame the bad room acoustics ...