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.
Please, would anyone have some info, possibly a diagram, of old COSMOS valve amp made in Japan...using 6BM8 in output. Any idea on when it was made? Appreciate greately!