I prefer an "instant on" type of tube. With Packetcluster most
everywhere, it's amazing how big a pileup can get while waiting
for that 3 minute warm-up! I've also found that tuning tetrode
amps for good linearity is very critical and not intuitive. My
choice would be something like the 3CX1200 types. A single tube
also avoids the current sharing problem of parallel tube amps.
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