I can definitely hear the imbalance. Pre-recorded tapes play fine, and levels are accurate on the VU meter. I have pro-recorded tapes with test tones and during playback the test tones are equal in both channels with the output level knobs set at the same settings for both channels. It is a recording issue. It is possible it's a problem with the record head, as it seems to have gotten worse over the years. I did take the back panel off, but after seeing the location of the circuit boards, I knew I was in for more trouble than it was worth, so I left the guts alone.
Here's how I figured out it was in the recording path:
Using a Nak Dragon, I output the built in 400hz test tone to the technics. I set the monitor switch to source, and adjust the input levels to 0db on the metes. While recording the test signal, I switched the monitor to tape, adjust the output dial till I get 0db on the right channel, but the left is only reading -5db. Switching the monitor back and forth, not only does the VU meter move, but you can here the differences in the level. The right channel stays at the same levels in both monitor modes.
The deck is large and rather expensive to ship. I'm wondering if changing out the headblock would be easier and would alignment still be needed after the change out?
A_L