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It may be that your inverter is having a little trouble with the load. Is 1000W a peak figure? A lot of the economy ones list their peak value in order to snare customers away from the higher cost units that will work as advertised.
This is a real easy check though; Get your multimeter and...
What is your input voltage limited to? Why not use a LM7815. Its voltage regulation is at least better than the several hundred millivolts you said your getting now. Plus you can clean it up a bit after the fact... I guess I'd need a bit more information, such as your input source, output...
The peak output current of a 7805 is listed as 2.2A on its datasheet, but its recommended output current is 1.5A. I'm a newb, but I would guess that your circuit is just drawing more power than the 7805 can handle (causing your voltage drop). I've linked the datasheet here
-Alex
Have you tried adjusting the "astigmatism" trimmer. It's the tiny one underneath the "Chan A" push button that requires the use of a small flathead. Also, what specifically happens when you adjust the focus knob? I attached a picture of a page from the Simplified Operating instructions that...
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