Thanks to Don and others for the response to the question I had about power
level fluctuations in the K2. The responders also commented on the use of
current technology smart linear amps that auto-switch bands and feed ALC or
power output signals back to the exciter. That is great, although the
convenience comes at a price that is justifiable, but nevertheless attention
getting.
About 35 years ago I managed WAS from Florida running 2 watts or less CW
from homebrew transmitters and mostly wire antennas. Once I climbed that
hill, I decided I wanted to go QRO to allow more comfortable ragchewing.
So, I built an amp with a pair of 6146B tubes in parallel and drove the
grids with my little qrp transmitters. This meant manual input and tank
bandswitching, not to mention re-dipping the final each time I changed
bands. The only non-junkbox and fleamarket parts in that amp were the
tubes. That was fun in building and exciting every time I made a contact.
So, I think the new linear for my K2 will be either a push-pull pair of
switching FET's or a single grounded grid 811A. The latter will allow me to
run 10 watts or so into the tube while the solid state approach will require
either a low level of drive or some amount of attenuation. Given my
background, manual bandswitching and tuning won't be a big deal and probably
more fun than just plugging stuff together. All is according to what you're
used to, I guess.
George Kuehn
N9AUP
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