Download the complete TUTORIAL of 2x90W Stereo Tube Power Amplifier with EL34. The document in PDF version contain of schematic diagram, part list, component guide, step by step how to build the circuit. This circuit is for advance hobbysts… 
Here 5W Tube Amplifier with EL84 circuit diagram.
35W Tube Power Amplifier with EL34. This tube amplifier designed in 1953 and worked from 1954 until 1989.
