Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com> I'm looking to buy some 833A Tubes if anyone has any available. New or used. I'm planning on building a high-side class B modulator for my dual 833A coil I have now for audio modulation. Please contact me at dhmccauley-at-spacecatlighting-dot-com if you have any available. Thanks Dan