These are amplifier designs that have been breadboarded, tested, and refined, but have not been assembled on their own chassis yet. Most are operating on laboratory power supplies. Since I already have too many amplifiers, some of these designs may never be taken past this stage.
The MiniTron amplifier was designed for entry into the Circuit Cellar / Microchip design contest. 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. One component of the MiniTron design is the cathode follower amplifier, which is presented here. This will evolve into a two stand alone SE designs and one P-P design in the coming months.
The Super Tube SE is what happens when the Simple 45 gets put on steroids. Tube purists who believe that all silicon is evil shouldn't go here. The experiments are just beginning but the progress will be charted on this page.
The O2 (Ongaku 2) is a project that I started well over a year ago and was never finished. It was being built very close to the original schematic which I found in an old Sound Practices magazine. The basic design has been breadboarded on Tubelab. The original Ongaku is a highly regarded amplifier.
The Simple 45 began as the starting point for a "Super Tube" amp design. I needed a simple single ended amplifier with excellent sound. The Simple 45 started out as a basic two stage single ended 45 amp. The design has matured into a sweet sounding 2 watt SE amp.
The 833 SE is another step in the evolution of the O2 - 845SE. The SE Amp Board is being used to drive an 833A through a PowerDrive board. The amp is still in the single channel prototype stage.