HH was one of the earliest UK-makers of solid-state sound-reinforcement kit. They were bought-out by Laney many years back. Read all about ’em here! BTW, these look very very similar to Farfisa’s 1970s line of PA and instrument amps. Is there a connection?
Also this: (70’s users of this kit). Amazing.
And WTF. ultimate high-school dance via HH kit. good lord.