Yes, it's Lumpy's computer that he watches the cartoon on. I found the pic saved on a forgotten cache of SWHS-related images from the research phase of an article I wrote for Star Wars Insider five years ago, observing the Special's 30th anniversary.
I found one older thread with a link to the original article on SW.com, which is not there anymore.
Although folks in that thread agree it's a radio, no one ID'd the manufacturer and model.
Alex