WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
Have a look at this German Website as well... It's the EAR done with Thorsten's recommendation on how to soup up the EAR which Thorsten posted on the AA...
I have built this version, albeit with a different power supply, and used air-vane tuning caps in the equalisation (the only circuit I know where this can be done).
It's very quiet, transparent and musical