I figured his youtube series would show up here. Take my Upvote. I'm now of the strong opinion that there is NO need for tubes any more, unless you've got old

I figured his youtube series would show up here. Take my Upvote. I'm now of the strong opinion that there is NO need for tubes any more, unless you've got old gear you want to keep working, and are willing to fork over the money for the tubes, and the power they waste as heat. It makes me sad, I've been learning how to repair old tube ham gear (Collins, et al) from a friend who's been doing it since he was a kid in the 1950s. I've learned to have strong contempt for silver mica capacitors, and a reverence for the silence of modern non-dynamotor power supplies. The strangest case was the RF amplifier that didn't work... because the ground lug the grid was connected to, wasn't a good ground.