I have a 900HD. Runs four 2SC2879's same as the Ameritron ALS-500. Since it's basically a 13dB amp (according to the 2879 specs), 10W CW drive should deliver 200W, 25W CW drive should deliver ~500W output at 13.8VDC. Even if it's only a 10dB amp, that will still do me fine. This is why I bought it, to provide some power for my 2510/2600. Haven't yet actually tried it. Have to examine the bias circuit to make sure it's absolutely AB1 linear, (otherwise it will produce trash, distortion, spurs, crap, splatter, etc.).