That makes sense, since Australia as a British colony is much younger than the US. I wonder when and why the US dropped the use of the "u" in words like colour, favour, labour, etc. I found another guy on eBay willing to make a deal on the remaining two knobs and some screws he had left over from the teardown. I also picked up the recommended screws for the output transistors from my local Home Depot. I've spent roughly an additional $120 due to the lost knobs and screws so far. I'll need more screws for the mounting the boards, chassis, bottom cover, and filter caps, but it hasn't been as bad as I originally thought it would be.