The 808s is different. In the service menu, select "G2 Adjust" and follow the on-screen directions.
The NEC's rely on the electronics exclusively to establish cut off levels and keep the G2 at a nominal level. There'sreally no reason to adjust it. It's really like the 808s that Scott asked about. There's an LED on the CRT output card that indidcates the correct G2 lelvel in service mode, then drives and cut offs are set separately.
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