![]() Then I started thinking (very dangerous). I built a very simple driver that could deliver 490 volts peak to peak from a 550 volt supply. I had some time to experiment with the cathode follower amp. They can be obtained from the IEEE for a fee. ![]() The IRE (now IEEE) papers are still covered by copyright and can not be posted. There are a few patents applied for in 1954 which are now expired. I became convinced that they could be used to create the "perfect output stage" so I am currently experimenting along those lines. His cathode follower work seems geared toward high impedance low capacitance input stages. He even explained the technique of varying the supply voltage with the audio signal but no design was documented. He wrote about many of the principles used in the MiniTron design in 1957. He wrote papers about cathode followers and other amplifier designs in the mid 1950's. See He is still publishing papers in the physics field. The augmented cathode follower thread led me to discover the work of James Ross Macdonald (after the MiniTron was developed). Again this was all the result of the thinking that occurred after someone posted a simple question on the diyAudio forums. This is the SE power amp that started it all. There will be one or two articles in their print magazine in the coming year. The complete project that was submitted to the contest is now posted on their web site. New developments will be here and on the MiniTron, MicroTron and MegaTron pages. I will post the entire design on the MiniTron pages as soon as I can get them formatted. This led to the "I am up to something but I can't say what" stuff I posted earlier. The judges could not know who was submitting what. The contest had some specific rules that had to be met. They can be used alone, or as part of the MicroTron, MiniTron, and MegaTron ( a push pull version that is capable of insane power ) amplifier systems. This will evolve into a two stand alone SE designs and one P-P design in the coming months. One component of the MiniTron design is the cathode follower amplifier, which is presented here. In a sea of microprocessor powered IC based gizmos this vacuum tube amplifier WON ONE OF THE CATEGORY PRIZES!!! It should be featured in the Circuit Cellar magazine, and on their web site in the near future. The MiniTron amplifier was designed for entry into the Circuit Cellar / Microchip design contest.
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