I built and still own this amp. Unfortunately because of FCC rules at the time there was no provision for 10 meters. Your power ratings are off a bit: at the time of manufacture, amps were rated by power INPUT to the finals. Power output for RTTY was about 400 watts 15 meters to 700 watts 80 meters. Because the power supply was limited, the tubes were hardly challenged--possibly a design feature. This amp could go 30 hours in the RTTY RU 500 watts out without missing a beat.