I've been using the barefoot K2 to drive an Alpha 89 amp to a full 800W actual output power. The amp uses pin diode switching and is virtually silent except for a small bit of fan noise. But when trying to drive a Yaesu Quadra amp I can only get around 250W output. The Quadra amp is a very loud, noisy amp with relay switching. Although its been very reliable with no failures, at least for me. If Elecraft ever actually gets an amp to market, it would be worth taking a look at. Especially if the amp uses pin diode switching and they are able to control the fan noise to be something reasonable. But just like the Quadra amp, it would no doubt require a higher drive level than a barefoot K2 if you want a decent output level. Hopefully Elecraft will come through with an amp kit this year. As its been a long time in the works. Frank W7is
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