Sadly, I decided to replace my Alpha 8410 in January 2021. While it was a 9.9 on a 10 point scale and effortlessly put out 1.5 KW or more on all bands, I decided that a) instant QSY was important to me, and b) the cost of replacement tubes “someday” was too high for my comfort. The replacement is an Elecraft KPA1500 and although its use spans a mere 24 hours, “I love it”. Great engineering, feature comforts, and excellent performance, especially when married up with an Elecraft transceiver.