I work primarily with surface mount electronics under high magnification at work. Building tube (valve) amplifiers is truly a relaxing pastime. You will note that a couple of prototypes utilize a bread tin for the chassis.
The Sonic MA1 and All American Four are based on designs from the book, “Building Vacuum Tube Guitar & Bass Amplifiers, Volume 1” by Tino Zottola.
The sonic MA1 is a 1950’s design utilizing a 12AX7 preamp and a 50L6 power stage. This amplifier also utilizes a solid state rectifier and an isolation power transformer for safety. Undistorted power output is about 3 watts.
Sonic MA1 Page