Had the amp a month. Only used it on 6m as I'm chasing DXCC on that band. I drive it with apx 34W from the K3. Display says 500w. Modest 5 el yagi on a 12' boom here. 7 new ones since I got the amp. Wrkd three JAs one afternoon. Not bad from NW Tennessee. I love the amp. Guess it will get it's first HF test when the ST0 comes on next week.... K9IL