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.
Hey Guys, I have a set of EL34 tubes that are marked Dynaco Gt Britain. They do not appear to be Mullard. They do not have the Mullard codes and no hole in the alignment stem. They have a code 922-107 on them and have a brown base with two large halo getters.