A stunning design of a classic triode amplifier. Direct coupling circuit by Shishido. Uses the triode 2A3 power tube driven by the 12AX7 tube. I use this design in my new single ended 2A3 tube amplifier. The circuit requires careful construction because the direct coupling design allow DC and AC signals pass to the grid of the 2A3 tube.

Here is the amplifier schematic for my EL84 tube amp diy project ( triode strapped ), based on decware se84. There is also and a modification with 6922 tube in driving stage.

and this is the modification schematic

Here are some interesting schematics for the 811A tube.

The Shishido (wavac) 811A tube amp schematic In the photo above, and the "kairo" modified schematic in the photo below:

And this is Ganti's 811A tube amp schematic :