Minder...
Season 4 episode 3, called "Senior Citizen Cane" (shown on UK's ITV4 on 14th April, first shown Jan 1984). The old boy likes his music loud & annoys all & sundry with this thing:



Much cocking about with the BBDB yields a result: it's a Sanyo M9829.
Not a top-flight b-box, but it's acting was better than some of the cast...
Trivia: a young-ish Gillian Taylforth appears in this episode (with her sister), not long before she got started in Eastenders...