When I load my Valiant to 450 ma on the meter, I only get 100 watts output. I've read that its possible that the meter is reading higher than actual plate current. Is there a way to calibrate the meter? Regards, John John D. Littlejohn, W9NET 4 Brushmeade Hollidaysburg, PA 16648 814-693-9767 jlittlej at mindspring.com w9net at amsat.org