I've been using my K2/100 to drive my Ameritron AL-811H for a couple of
years, and it works great.
Initially, before I had the KPA100, I used the K2 to drive the amp to
about 200 watts or so, and built up the simple single transistor keying
circuit described in the Elecraft archives, to key the amplifier. That
worked fine.
Later, when I built the KPA100, I used the high voltage output keying
line to drive the amp, and that worked fine as well.
Still later, after getting tired of listening to the clanking of the
relay in the AL-811H, I bought the Ameritron QSK-5 QSK-T/R unit, and
that was the best solution of all. Not only is there no noise from the
relay in the amplifier, but the tubes in the amplifier are cut-off so no
plate current flows until just a couple of milliseconds before the rf is
delivered, and it returns to cutoff within a couple of milliseconds
after the rf has finished. So, the amp runs cooler, and is absolutely
quiet except for the almost inaudible 'tick' of the reed relay inside
the QSK-5 unit.
Having said all that, I don't really use the amplifier very often, but
when I do, the combination works great.
73, Dale WA8SRA
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