8 faulty amps,sounds like a little misuse going on.Good luck!!
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Did you manage to fix the amplifiers?
Are you talking about the HBQ-475 or HBQ-1000? I have a pair of HBQ-475 and read VDH supplied many units to a studio in South Africa.
Mine blew not long after I bought them - I was careless by letting the speaker cables short, so it was my mistake. It blew gracefully (no smoke like Krell or Audio Research ;-)
VDH told me the transistors they used were no longer made but they still had some spares left. Only one side blew, but I replaced all transistors from both sides so that the sound would match.
Can you send some photos of the amp, showing the inside too?