On Thu, 17 Jan 2008 17:12:43 EST, W1dxh at aol.com wrote: >is there any thing i should know before hand. As others have suggested, be conservative. Grid current is a well known failure mode, so my absolute rule is to keep the grid current below 30 mA. Period. For RTTY, I'd run the amp around 800 watts out, maybe 600w if contesting. 73, Jim K9YC