Wow, small world! It was just interesting to me, without particular purpose. I saw the link on one of the Google ads at the bottom of a post, so I clicked on it and looked around. I remember seeing some people using transmitter tubes to build audio amps. High power SET amps, as I recall. Think of the transformers needed for that, huh?!!Aside from financial concerns, what are some of the trade-offs you'd expect from using such a tube for high-power audio amps?