I built a 6L6 (metal) transmitter using the tube upside down in a cup of mineral oil to get 75W input (the old novice limit). Ran like that all day and night long. Mike, W1NR Carl wrote: > And then there were those who immersed metal 6L6's and 1614's upside down in > a bucket of water and ran them at 100W out. > > Carl > KM1H > >