My favorite class-A single-ended (SE) tube amplifier an RCA 2A3 triode driven by a Phillips E180F pentode. The audio output transformers are Hammond 125 FSE.
The power is external in the black box on the right side. 2x4 w and consists of Black Gate and Rubycon capacitors. Resistors carbon
film and Mills. Autobias. Interstage transformers
