I just was given to me for free a Sanyo M9926 boombox. All intact and needing a good cleaning. The volume/balance pot needs major deoxit cleaning...very scratchy volume and speaker cuts out on right side. Tape player play button doesn't want to engage to play,have to hold it down, but spindles all turn for ffwd/rewind, and play. What year is this baby made? I am guessing 1980. Its quite heavy for the size.