When designing an amplifier with basic components, its circuitry can become simple. No constant current sources or local regulated operating points, and no microchip band-aids. While experimenting with various line output transformer designs it was necessary to build a simple tube amplifier stage. A 6J5 was selected due to its popularity and basic geometry. Having consulted with Cy Brenneman, “Triode Protologyst” as to the operating points needed for lowest distortion, a breadboard was built and fired up. As transformers were connected, measured, cussed at (a little-known engineering procedure) and rounded, an idea came to mind as to coupling the source closer to this transformer.
The Ultrapath Line Amp – >>>[LINK]<<<