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.
'Thank you for concern. I've got already the schem from spoke e-mail and I'm glad he fount it. Now trying to differenciate it and I'd like to build the old one with new power supply.