curious about the set in the pictures- the leaflet refers to 1 valve, but the set clearly has 2.
Also, ISTR that HAC receivers were much more recent than the style of your set (they were still advertised in the 60's and 70's), but maybe they've been around longer than my memory and just been modernised over the years. The one valver kits I recall used open chassis and front panel construction rather than mahogany box. In fact the octal valves are somewhat later than the style of enclosure so maybe your set is a home brew interpretation using junk box bits rather than an actual HAC.
Whatever yours is, it looks like an interesting and hopefully rewarding challenge to get working.
Chris